By default BuddyPress operates across sites in a multisite/multinetwork context. You’ll need to look at one of these plugins depending on your requirements:
It’s not discontinued, although @imath has passed development on to someone else. The canonical development repository is now: https://github.com/G3ronim0/rendez-vous
@jdeyla It would be unusual if a plugin that offers the kind of rich functionality that Rendez Vous does worked flawlessly out-of-the-box with your theme. I always expect to do some CSS work to adapt plugin output to my needs.
