Which makes the honest advice here uncomfortable and worth saying anyway: ask us about an off-peak date. December through March is a thousand dollars lower on the hall and nothing about the room changes. For a charity, that is the single easiest saving available and most venues will not volunteer it.
Beyond that, a gala needs three things at once — dinner for everybody, a focal point for the programme, and somewhere to display a silent auction that people will actually walk past. The hall is wide enough to do all three without the auction ending up in a corridor.
Practically
The bar is in-house and runs on the same per-guest packages as a wedding, or on consumption if you would rather guests pay. Parking is free and on site, which matters when your attendees have already been asked for money once.
Tell us it is a fundraiser when you enquire. It changes what we suggest.