Anna
I sent you a member e-mail with pphone, etc.
If you get 30 or so people who sleep on the floor and/or go to local hotels, it should not be a big problem. Is your place suitable for back yard camping? If it gets too popular, it would get out of hand if 100 people show up at one house.
I think we need several regional gatherings, rather than thinking of one massive get together, say 8 or so in the states, a few in Canada, a few in Australia, one or more each in England, Scotland, Ireland, ...
And remember to post which regular festivals you go to to collect a group to look for each other.