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Fishing for some #fediverse advice: I want to build an 'agency' hub for artists where...

- each virtual host has a calendar of events, a contact form, static info pages, photo/video/audio galleries and an rss-equipped blog.
- individual accts can have within-host discussions, eg event coordination, planning etc.
- accts are by invitation only

Kind of like reinventing #Posterous for #ActivityPub, EVERYTHING about that extinct platform is exactly what I'm after.

Where should I start?