Gaybros of reddit, I'm going to a event at a gay bar. What do I need to know?

About me: I'm a 23 year old male. I'm thinking I'm bi but am not sure. I'm reasonably good looking(not that that matters).

I'm attending a BDSM event(not a specifically gay one). The event is at a gay bar. According to my mentor, The patrons of the bar are very active in these events.

Does anyone have any advice? Etiquette knowledge? Etc?

Attending this event is a huge step for me. I'm just trying to take it one step at a time.