Thanks for the support guys, I kept what you said in mind when I went =-)
And yeah, went so much better than I thought. Here's how it went:
I arrived, on my own, went to the bar and got a drink. Sat by myself in the corner for quite a long time, just kind of fiddling with my phone. Eventually, however, I noticed a group starting to form at the table next to me. One guy sort of looked gay to me, and I think I heard someone say "gay" lol, but I wasn't totally sure if they were there for that so I kind of left it for a while. This one guy kept looking at me, I reckoned he probably figured me out.
I waited until he went up to the bar by himself, and headed up there as well. I basically said, "Um, excuse me if I'm about to make a total idiot out of myself, but are you guys here for the LGBT thing?" To my relief, he said yes!
Turned out he was bi. We got chatting, and he actually said he was gonna come over and talk to me after he got his drink lol, but even so I'm still glad I worked up the courage to approach him. We got chatting, he was a really nice guy and made me feel so much better, I explained to him how awkward I felt when I first got there.
Eventually, we both got talking to these other two guys; one really cute Spanish gay guy and another guy; who already had a boyfriend, but hey, can't win 'em all =P
It was great, we became really fast friends, and err, got quite drunk and stayed out until 2am, was fun =P
So yeah, I didn't get laid or anything, but I'm so glad I actually went out and did it. We're planning to do the same thing this Saturday, and hopefully I can get to know some of the other guys better as well. So yeah, it went well =D