diff --git a/lib/federation/activity_stream/converter/event.ex b/lib/federation/activity_stream/converter/event.ex
index c89aced1c..6328b56f6 100644
--- a/lib/federation/activity_stream/converter/event.ex
+++ b/lib/federation/activity_stream/converter/event.ex
@@ -8,6 +8,7 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Event do
 
   alias Mobilizon.Actors.Actor
   alias Mobilizon.Addresses.Address
+  alias Mobilizon.Events.Categories
   alias Mobilizon.Events.Event, as: EventModel
   alias Mobilizon.Medias.Media
 
@@ -73,7 +74,7 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Event do
           medias: medias,
           begins_on: object["startTime"],
           ends_on: object["endTime"],
-          category: object["category"],
+          category: get_category(object["category"]),
           visibility: visibility,
           join_options: Map.get(object, "joinMode", "free"),
           local: is_local?(object["id"]),
@@ -330,4 +331,15 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Event do
          _participant_count
        ),
        do: nil
+
+  @spec get_category(String.t() | nil) :: String.t()
+  defp get_category(nil), do: "MEETING"
+
+  defp get_category(category) when is_binary(category) do
+    if category in Enum.map(Categories.list(), &String.upcase(to_string(&1.id))) do
+      category
+    else
+      get_category(nil)
+    end
+  end
 end