I imagine it’d largely consist of “fuck Spez” and warring German and French flags. A bit like r/place.
I think we are better off coming up with our own traditions and events, some will emerge organically and others will come about from spitballing like this.
A completely separate site (à la pxls.space) related only in spirit?
I think the more interesting option is a separate Fediverse service for some kind of collaborative art project that everyone using, for example, ActivityPub, could contribute to. Then people could then set up their own instances for different variations on the theme. Perhaps something like an online and infinite exquisite corpse?