This is likely a regional thing but the one I went to, which was billed as LGBTQ friendly, had 20 participants, 1 bi woman, 1 bi man, 2 straight women and the rest was straight men.
It was not well organized, cost $20, used prompts that weren't relevant since the early 90's and overall was awkward and depressing. I hope yours fares better.
Pretty sure I was the only one on speed too. (Joking!)