Rebased has integrated full support of Mobilizon events

AFAIK Rebased does not interoperate with Threadiverse better than upstream Pleroma. They mainly added support of events with full interoperability with Mobilizon.

This said, most that Feediverse ;) (microblogging) apps have achieved with Threadiverse is ability to follow comms from here and post to them.

You may be interested in Catodon (although it contains vibed code)

• lemmy.wtf provides peertube.wtf and piefed.dk too.
• lemmy.world is hosted by https://fedihosting.foundation/ , together with other .world instances and several stux’ fediverse instances, like mstdn.social and gram.social
• https://dotzip.ltd/
• https://fedecan.ca/
• infosec.exchange has got many sister services, listed here
• https://devol.it/ hosts largest Italian fediverse instances
• https://fediverse.neat.pub/
• Framasoft made Mobilizon (and hosta its main French instance), makes PeerTube and hosta e.g. Framapiaf (a Mastodon instance) and more
• many such providers in France are members of CHATONS
• from Poland, there is wspanialy.eu, with Mastodon, FreshRSS, and recently also Matrix and WriteFreely

this obviously is not exhaustive