Display "published by" (organized by is not always relevant)
Sometimes one might want to add an event to mobilizon that one does not organize themself. It would be nice if the popup where the organizer is chosen could be expanded to allow a free text entry. In this case it would still be necessary to choose a user/group as the organizer (in order to see who submitted the event). At the event page the original "fre-text-organizer" would be shown first, second the user submitting the event.