Halls In Colorado Big Enough For 350 Or More

Well ima have my 15 in september 2006 but i need a hall tht can hold up to 350 or more and da place has to be pretty. Da price doesnt matter. Da only places i can find are clubs. My daddy owns a club but his place isnt big enough for 350 so he is trying to get a hook up with the owners of "the castle" on i-25 and 120th or at " da paladium" on pecos and some other highway. Well if ya have any ideas plz email me at :
Baybgrl14@hotmail.com.
Thnks