diff --git a/js/src/components/Activity/EventActivityItem.vue b/js/src/components/Activity/EventActivityItem.vue
index 4c9f1a359..cdb13264e 100644
--- a/js/src/components/Activity/EventActivityItem.vue
+++ b/js/src/components/Activity/EventActivityItem.vue
@@ -42,6 +42,7 @@ import { usernameWithDomain } from "@/types/actor";
 import { formatTimeString } from "@/filters/datetime";
 import {
   ActivityEventCommentSubject,
+  ActivityEventParticipantSubject,
   ActivityEventSubject,
 } from "@/types/enums";
 import { computed } from "vue";
@@ -90,6 +91,14 @@ const translation = computed((): string | undefined => {
         return "You posted a comment on the event {event}.";
       }
       return "{profile} posted a comment on the event {event}.";
+    case ActivityEventParticipantSubject.EVENT_NEW_PARTICIPATION:
+      if (isAuthorCurrentActor.value) {
+        return "You joined the event {event}.";
+      }
+      if (props.activity.author.preferredUsername === "anonymous") {
+        return "An anonymous profile joined the event {event}.";
+      }
+      return "{profile} joined the the event {event}.";
     default:
       return undefined;
   }
diff --git a/js/src/i18n/en_US.json b/js/src/i18n/en_US.json
index dc52d2ec0..58d487f1f 100644
--- a/js/src/i18n/en_US.json
+++ b/js/src/i18n/en_US.json
@@ -1579,5 +1579,8 @@
   "Access drafts events": "Access drafts events",
   "This application will be allowed to list and view your draft events": "This application will be allowed to list and view your draft events",
   "Access group suggested events": "Access group suggested events",
-  "This application will be allowed to list your suggested group events": "This application will be allowed to list your suggested group events"
+  "This application will be allowed to list your suggested group events": "This application will be allowed to list your suggested group events",
+  "{profile} joined the the event {event}.": "{profile} joined the the event {event}.",
+  "You joined the event {event}.": "You joined the event {event}.",
+  "An anonymous profile joined the event {event}.": "An anonymous profile joined the event {event}."
 }
\ No newline at end of file
diff --git a/js/src/i18n/fr_FR.json b/js/src/i18n/fr_FR.json
index bc91b3b8e..dba74ff49 100644
--- a/js/src/i18n/fr_FR.json
+++ b/js/src/i18n/fr_FR.json
@@ -1575,5 +1575,8 @@
   "Access drafts events": "Accéder aux événements brouillons",
   "This application will be allowed to list and view your draft events": "Cetta application sera autorisée à lister et accéder à vos événements brouillons",
   "Access group suggested events": "Accéder aux événements des groupes suggérés",
-  "This application will be allowed to list your suggested group events": "Cetta application sera autorisée à lister les événements de vos groupes qui vous sont suggérés"
+  "This application will be allowed to list your suggested group events": "Cetta application sera autorisée à lister les événements de vos groupes qui vous sont suggérés",
+  "{profile} joined the the event {event}.": "{profile} a rejoint l'événement {event}.",
+  "You joined the event {event}.": "Vous avez rejoint l'événement {event}.",
+  "An anonymous profile joined the event {event}.": "Un profil anonyme a rejoint l'événement {event}."
 }
diff --git a/js/src/types/activity.model.ts b/js/src/types/activity.model.ts
index c5c218757..f3ecb913e 100644
--- a/js/src/types/activity.model.ts
+++ b/js/src/types/activity.model.ts
@@ -3,6 +3,7 @@ import { IMember } from "./actor/member.model";
 import {
   ActivityDiscussionSubject,
   ActivityEventCommentSubject,
+  ActivityEventParticipantSubject,
   ActivityEventSubject,
   ActivityGroupSubject,
   ActivityMemberSubject,
@@ -21,7 +22,8 @@ export type ActivitySubject =
   | ActivityResourceSubject
   | ActivityDiscussionSubject
   | ActivityGroupSubject
-  | ActivityEventCommentSubject;
+  | ActivityEventCommentSubject
+  | ActivityEventParticipantSubject;
 
 export interface IActivity {
   id: string;
diff --git a/js/src/types/enums.ts b/js/src/types/enums.ts
index 0eb3841bb..dc551f3f9 100644
--- a/js/src/types/enums.ts
+++ b/js/src/types/enums.ts
@@ -200,6 +200,10 @@ export enum ActivityEventCommentSubject {
   COMMENT_POSTED = "comment_posted",
 }
 
+export enum ActivityEventParticipantSubject {
+  EVENT_NEW_PARTICIPATION = "event_new_participation",
+}
+
 export enum ActivityPostSubject {
   POST_CREATED = "post_created",
   POST_UPDATED = "post_updated",
diff --git a/lib/federation/activity_pub/actions/accept.ex b/lib/federation/activity_pub/actions/accept.ex
index 87912de97..1480a262f 100644
--- a/lib/federation/activity_pub/actions/accept.ex
+++ b/lib/federation/activity_pub/actions/accept.ex
@@ -82,6 +82,11 @@ defmodule Mobilizon.Federation.ActivityPub.Actions.Accept do
       )
 
       Scheduler.trigger_notifications_for_participant(participant)
+
+      Mobilizon.Service.Activity.Participant.insert_activity(participant,
+        subject: "event_new_participation"
+      )
+
       participant_as_data = Convertible.model_to_as(participant)
       audience = Audience.get_audience(participant)
 
diff --git a/lib/federation/activity_pub/types/events.ex b/lib/federation/activity_pub/types/events.ex
index 13b3e2f12..94cd9d665 100644
--- a/lib/federation/activity_pub/types/events.ex
+++ b/lib/federation/activity_pub/types/events.ex
@@ -224,6 +224,10 @@ defmodule Mobilizon.Federation.ActivityPub.Types.Events do
     cond do
       Mobilizon.Events.get_default_participant_role(event) == :participant &&
           role == :participant ->
+        Mobilizon.Service.Activity.Participant.insert_activity(participant,
+          subject: "event_new_participation"
+        )
+
         {:accept,
          Actions.Accept.accept(
            :join,
diff --git a/lib/mobilizon/activities/activities.ex b/lib/mobilizon/activities/activities.ex
index 52b7683ed..d851f19fb 100644
--- a/lib/mobilizon/activities/activities.ex
+++ b/lib/mobilizon/activities/activities.ex
@@ -19,6 +19,7 @@ defmodule Mobilizon.Activities do
 
   @activity_types ["event", "post", "discussion", "resource", "group", "member", "comment"]
   @event_activity_subjects ["event_created", "event_updated", "event_deleted", "comment_posted"]
+  @participant_activity_subjects ["event_new_participation"]
   @post_activity_subjects ["post_created", "post_updated", "post_deleted"]
   @discussion_activity_subjects [
     "discussion_created",
@@ -48,12 +49,23 @@ defmodule Mobilizon.Activities do
   @settings_activity_subjects ["group_created", "group_updated"]
 
   @subjects @event_activity_subjects ++
+              @participant_activity_subjects ++
               @post_activity_subjects ++
               @discussion_activity_subjects ++
               @resource_activity_subjects ++
               @member_activity_subjects ++ @settings_activity_subjects
 
-  @object_type ["event", "actor", "post", "discussion", "resource", "member", "group", "comment"]
+  @object_type [
+    "event",
+    "participant",
+    "actor",
+    "post",
+    "discussion",
+    "resource",
+    "member",
+    "group",
+    "comment"
+  ]
 
   defenum(Type, @activity_types)
   defenum(Subject, @subjects)
diff --git a/lib/service/activity/activity.ex b/lib/service/activity/activity.ex
index 9c436fecf..1262102c6 100644
--- a/lib/service/activity/activity.ex
+++ b/lib/service/activity/activity.ex
@@ -4,7 +4,17 @@ defmodule Mobilizon.Service.Activity do
   """
 
   alias Mobilizon.Activities.Activity
-  alias Mobilizon.Service.Activity.{Comment, Discussion, Event, Group, Member, Post, Resource}
+
+  alias Mobilizon.Service.Activity.{
+    Comment,
+    Discussion,
+    Event,
+    Group,
+    Member,
+    Participant,
+    Post,
+    Resource
+  }
 
   @callback insert_activity(entity :: struct(), options :: Keyword.t()) ::
               {:ok, Oban.Job.t()} | {:ok, any()} | {:error, Ecto.Changeset.t()}
@@ -45,4 +55,8 @@ defmodule Mobilizon.Service.Activity do
   defp do_get_object(:comment, comment_id) do
     Comment.get_object(comment_id)
   end
+
+  defp do_get_object(:participant, participant_id) do
+    Participant.get_object(participant_id)
+  end
 end
diff --git a/lib/service/activity/participant.ex b/lib/service/activity/participant.ex
new file mode 100644
index 000000000..791e67fff
--- /dev/null
+++ b/lib/service/activity/participant.ex
@@ -0,0 +1,48 @@
+defmodule Mobilizon.Service.Activity.Participant do
+  @moduledoc """
+  Insert an event activity
+  """
+  alias Mobilizon.{Actors, Events}
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Events.Participant
+  alias Mobilizon.Service.Activity
+  alias Mobilizon.Service.Workers.ActivityBuilder
+
+  @behaviour Activity
+
+  @impl Activity
+  def insert_activity(event, options \\ [])
+
+  def insert_activity(
+        %Participant{event_id: event_id, actor_id: actor_id, id: participant_id} =
+          _participant,
+        options
+      ) do
+    actor = Actors.get_actor(actor_id)
+    event = Events.get_event!(event_id)
+    subject = Keyword.fetch!(options, :subject)
+
+    ActivityBuilder.enqueue(:build_activity, %{
+      "type" => "event",
+      "subject" => subject,
+      "subject_params" => %{
+        actor_name: Actor.display_name(actor),
+        event_title: event.title,
+        event_uuid: event.uuid
+      },
+      "group_id" => event.attributed_to_id,
+      "author_id" => actor.id,
+      "object_type" => "participant",
+      "object_id" => participant_id,
+      "inserted_at" => DateTime.utc_now()
+    })
+  end
+
+  @impl Activity
+  def insert_activity(_, _), do: {:ok, nil}
+
+  @impl Activity
+  def get_object(participant_id) do
+    Events.get_participant(participant_id)
+  end
+end
diff --git a/lib/service/activity/renderer/event.ex b/lib/service/activity/renderer/event.ex
index 809583bb0..3bf07232f 100644
--- a/lib/service/activity/renderer/event.ex
+++ b/lib/service/activity/renderer/event.ex
@@ -1,6 +1,6 @@
 defmodule Mobilizon.Service.Activity.Renderer.Event do
   @moduledoc """
-  Insert a comment activity
+  Insert an event activity
   """
   alias Mobilizon.Activities.Activity
   alias Mobilizon.Actors.Actor
@@ -67,6 +67,16 @@ defmodule Mobilizon.Service.Activity.Renderer.Event do
             url: event_url(activity)
           }
         end
+
+      :event_new_participation ->
+        %{
+          body:
+            dgettext("activity", "%{profile} joined your event %{event}.", %{
+              profile: profile(activity),
+              event: title(activity)
+            }),
+          url: event_url(activity)
+        }
     end
   end
 
diff --git a/lib/service/notifier/email.ex b/lib/service/notifier/email.ex
index acd213d2e..750c70706 100644
--- a/lib/service/notifier/email.ex
+++ b/lib/service/notifier/email.ex
@@ -96,7 +96,7 @@ defmodule Mobilizon.Service.Notifier.Email do
 
   defp can_send_activity?(activity, user, options) do
     Logger.warning(
-      "Can't check if user #{inspect(user)} can be sent an activity (#{inspect(activity)}) (#{inspect(options)})"
+      "Can't check if user #{inspect(user.email)} can be sent an activity (#{inspect(activity)}) (#{inspect(options)})"
     )
 
     false
diff --git a/lib/web/templates/email/activity/_event_activity_item.html.heex b/lib/web/templates/email/activity/_event_activity_item.html.heex
index 9af392741..0497d658d 100644
--- a/lib/web/templates/email/activity/_event_activity_item.html.heex
+++ b/lib/web/templates/email/activity/_event_activity_item.html.heex
@@ -51,4 +51,13 @@
       })
       |> raw %>
     <% end %>
+  <% :event_new_participation -> %>
+    <%= dgettext("activity", "%{profile} joined your event %{event}.", %{
+      profile: "<b>#{escaped_display_name_and_username(@activity.author)}</b>",
+      event:
+        "<a href=\"#{Routes.page_url(Mobilizon.Web.Endpoint,
+        :event,
+        @activity.subject_params["event_uuid"]) |> URI.decode()}\">#{escape_html(@activity.subject_params["event_title"])}</a>"
+    })
+    |> raw %>
 <% end %>
diff --git a/lib/web/templates/email/activity/_event_activity_item.text.eex b/lib/web/templates/email/activity/_event_activity_item.text.eex
index 390bd2611..30b05abc0 100644
--- a/lib/web/templates/email/activity/_event_activity_item.text.eex
+++ b/lib/web/templates/email/activity/_event_activity_item.text.eex
@@ -1,31 +1,37 @@
 <%= case @activity.subject do %><% :event_created -> %><%= dgettext("activity", "The event %{event} was created by %{profile}.", 
     %{
-        profile: Mobilizon.Actors.Actor.display_name_and_username(@activity.author),
+        profile: display_name_and_username(@activity.author),
         event: @activity.subject_params["event_title"]
     }
 ) %>
 <%= Routes.page_url(Mobilizon.Web.Endpoint, :event, @activity.subject_params["event_uuid"]) |> URI.decode() %><% :event_updated -> %><%= dgettext("activity", "The event %{event} was updated by %{profile}.", 
     %{
-        profile: Mobilizon.Actors.Actor.display_name_and_username(@activity.author),
+        profile: display_name_and_username(@activity.author),
         event: @activity.subject_params["event_title"]
     }
 ) %>
 <%= Routes.page_url(Mobilizon.Web.Endpoint, :event, @activity.subject_params["event_uuid"]) |> URI.decode() %><% :event_deleted -> %><%= dgettext("activity", "The event %{event} was deleted by %{profile}.", 
     %{
-        profile: Mobilizon.Actors.Actor.display_name_and_username(@activity.author),
+        profile: display_name_and_username(@activity.author),
         event: @activity.subject_params["event_title"]
     }
 ) %>
 <% :comment_posted -> %><%= if @activity.subject_params["comment_reply_to"] do %><%= dgettext("activity", "%{profile} replied to a comment on the event %{event}.", 
     %{
-        profile: Mobilizon.Actors.Actor.display_name_and_username(@activity.author),
+        profile: display_name_and_username(@activity.author),
         event: @activity.subject_params["event_title"]
     }
 ) %>
 <%= Routes.page_url(Mobilizon.Web.Endpoint, :event, @activity.subject_params["event_uuid"]) |> URI.decode() %><% else %><%= dgettext("activity", "%{profile} posted a comment on the event %{event}.", 
     %{
-        profile: Mobilizon.Actors.Actor.display_name_and_username(@activity.author),
+        profile: display_name_and_username(@activity.author),
         event: @activity.subject_params["event_title"]
     }
 ) %>
-<%= Routes.page_url(Mobilizon.Web.Endpoint, :event, @activity.subject_params["event_uuid"]) |> URI.decode() %><% end %><% end %>
\ No newline at end of file
+<%= Routes.page_url(Mobilizon.Web.Endpoint, :event, @activity.subject_params["event_uuid"]) |> URI.decode() %><% end %><% :event_new_participation -> %><%= dgettext("activity", "%{profile} joined your event %{event}.",
+    %{
+        profile: display_name_and_username(@activity.author),
+        event: @activity.subject_params["event_title"]
+    }
+) %>
+<%= Routes.page_url(Mobilizon.Web.Endpoint, :event, @activity.subject_params["event_uuid"]) |> URI.decode() %><% end %>
\ No newline at end of file
diff --git a/lib/web/views/email_view.ex b/lib/web/views/email_view.ex
index c103e4fcf..82b0e74d9 100644
--- a/lib/web/views/email_view.ex
+++ b/lib/web/views/email_view.ex
@@ -25,7 +25,6 @@ defmodule Mobilizon.Web.EmailView do
   defdelegate datetime_relative(datetime, locale \\ "en"), to: DateTimeRenderer
   defdelegate render_address(address), to: Address
   defdelegate is_same_day?(one, two), to: DateTimeRenderer
-  defdelegate display_name_and_username(actor), to: Actor
   defdelegate display_name(actor), to: Actor
   defdelegate preferred_username_and_domain(actor), to: Actor
 
@@ -38,7 +37,13 @@ defmodule Mobilizon.Web.EmailView do
 
   def escaped_display_name_and_username(actor) do
     actor
-    |> Actor.display_name_and_username()
+    |> display_name_and_username()
     |> escape_html()
   end
+
+  def display_name_and_username(%Actor{preferred_username: "anonymous"}) do
+    dgettext("activity", "An anonymous profile")
+  end
+
+  def display_name_and_username(actor), do: Actor.display_name_and_username(actor)
 end