Where: Vulcano (134, 101, 267)
High in the sky of the Vulcano sim there is the Bzaar spaceship (roughly inspired by Spaceship Yamato).
There is a lounge on the main deck that provides a space ideal for coworking, I'm more than happy to host SL coworkers there. Here's a list of the facilities so far:
Also the main deck is a huge 50m x10m open stage, that is being used for events, parties and other social/artsy purposes.