Don't forget to RSVP for Legends of the Galaxy Star Wars RPG at FFG in Roseville. Tomorrow at 1pm

https://tockify.com/legends.of.the.galaxy/detail/7/1467568800000

I know I'm kind of late, but what does RSVP stand for in this context? I think I'm supposed to respond to an invitation when that comes up, but that doesn't make to seem sense here.