Maybe you will get lucky and Larian will allow all those available to attend ? I'm not a sheep - mostly because I'm anti-sheep but I hate these sort of things because two people will be very happy and the other 10 not so much. If it has to be two and only two I would either let the 12 who want to go to decide among themselves without peer pressure or interference or pick two names from a hat.
Hum. Well hum. I was going to say more but I'll wait to see if Larian comments further.