I prefer having it at someone's house as well. It's not essential as I'm comfortable with wherever, but it seems nicer to be in someone's house. After all, I'm looking to make friends that have similar values, why keep everyone out of my house? Everyone I've met seems really cool.
I'll be the first to admit the my house isn't very EREish, as I bought it before I started down the personal finance / early retirement path. However it's hardly a beacon to consumerism and the benefit is that it makes for a great gathering place where I can have friends over.
I also realize that ERE and being on an online forum attracts a personality type that is tends to be introverted. I'm an INTJ myself so I understand completely. I certainly wouldn't want anyone to not go because they feel uncomfortable with the setting. Organizing an gathering for introverts is always a challenge :)
That being said, I'm sure we can all come to a consensus that is acceptable to everybody and a lot of fun. Just list your preferences and any dealbreakers and we'll come up with a place in no time.
Venue: I prefer someone's house. It seems more comfortable and friendly to me, plus I'm curious to see how people live.
Location: I'll travel to wherever
Alcohol: I'd love to share some homebrews
Dealbreakers: I have plans on the weekends before May 12th.