Join the Harry Potter meetup group for a cross-meetup trivia night. Subject matter is general geek/all fandoms trivia including TV shows, books, SF/F, whatever.
I'm not really sure about the whole 'versus' thing, I think what will happen is we'll all break into small teams so you could potentially be teamed up with anyone from either meetup, depending on who you make friends with before trivia starts. I just wanted to make it sound exciting.
The space isn't that huge so please RSVP responsibly and change your status if you have to cancel.
Event is UPSTAIRS. The space is reserved so there shouldn't be any problem finding us, we will be the only people up there. I won't be giving out my phone number as usual, just show up at the bar and you should be fine.
If you have any questions about the Harry Potter group, feel free to ask. They're cool and they are being gracious enough to host trivia for us.
Oh and don't forget, we'll be at a pub. Lots to drink. They also have food if you are interested.
Remember, this is general geeky fandom, TV, Movies, Science Fiction and Fantasy trivia, NOT all harry potter trivia.