I don't get why a person's sexual orientation should have anything to do with gaming.
Anyway have fun.
Predictable response. It doesn't.
My guess is that the event exists for people to find dates who'll put up with their gaming addictions. I feel like a lot of people go to other conventions and stuff like that for similar reasons. It just happens that at this event, people can flirt to their hearts' content with the gender(s) of their choice without having to worry as much about making anyone feel uncomfortable.
On topic: not me, never heard of it. :]