Venue Rental for 500 People?

Does anyone know of a bar, club, or other such establishment that could accommodate a party of 500? My company just hosted a conference in Nashville and rented out one of the honky tonk bars for a private party and it was a hit. We’re hosting the conference in Fort Lauderdale next year and would love to be able to do something similar, but we don’t know where to start as far as sourcing a space. Any leads would be greatly appreciated!