The first Anime Boston had a similar problem -- when the demand exceeded their wildest expectations. They didn't know in advance how many people would show up...they hoped for 800 and would have broken even with 800. They had to close the doors on Saturday at 1 p.m. when they hit the hotel's fire marshall cap (something like 2,200).

But Mike points out that a steampunk con should only be taking reservations by telegraph...