Handle RSVP ActivityPub vocabulary on Events
For Friendica compatibility.
As well as
Undo on these activities.
Needs to check if approval is supported
Why we have a different vocabulary
Friendica event support was made with "friends"/"people you know" in mind, so they send an
Invite containing an
Event to a specific audience, and receivers can
On the other mind, Mobilizon events are meant to be announced to the world (it makes no sense inviting everyone to let them know of the event), so it
Event, and anyone that received the event can