As you'd expect, Opus Novum, in the Chat RP section; but I think there's a server bug causing it to remain private despite being set to public post-creation.
Cbox: Better yet, Tom, I can just choose not to be a dork and actually remove the "Private Group" checkbox. Apparently there are two settings that affect said status. =p
As proof of concept, I've done up a little teaser for my own plot candy; consider this a test-run of the roleplay's logistics and an excuse to encourage more people to join. :3
In case you guys didn't get any alerts, I've got a charp thread up. I plan on grabbing some people this weekend for a big ol' expository scene in the Roleplay City, so if you're interested and able, you can keep an eye on the cbox or send me a note to get synced up. :3