Emily Short has scheduled a Seltani build/play jam, hosted by the London IF meetup. This will be Sept 19, 3-5 pm London time. I will be hanging around as, I don't know, groundskeeper and tour guide emeritus?
Seltani was my Twine/Myst-Online/MUD mashup project from a few years back. (Technically it is none of those things. Nor is it holy, Roman, or an empire. But that's the best way to explain it.) I haven't touched Seltani in a long time, but I keep the server running.
See Emily's post for details and how to sign up for the meeting.