Is there a way to see this? I've lost track and want to leave a couple and join some of the smaller groups, but cannot for the life of me remember what I've joined.

I've been looking for it as well, but seeing it was implemented rather last minute, I don't think this exists just yet. Try checking either the legacy site for green checks if you posted on any of the masquerade threads, or on the kumos site for the music note ones which are the dance groups, to see if any of those rings a bell?

just as a heads up, we are experiencing a glitch where, when leaving a group (confirming that we have left with the (demon left the group) the kumos site still sees us as being 3/3 and we are unable to join any other groups

Thanks for the help guys!

I finally found the ones I was in.