Look, I’ll be honest with you: I don’t know how this is going to go. You’ll have plenty of opportunity to be a fly on the wall.
That said, you’ll have plenty of opportunity to put yourself out there, too. By asking for a dance, you’re communicating “I’m here to have fun”. Try to say that to as many people as you can and you’ll have a blast.
Also, Salsa is so dang easy to do the basic step. 90% of the Latin dances I’ve been to have been just doing the basic step for the whole song and looking at people around me for inspiration of moves to try.
You’re gonna do great.