Dinner party for about 50 in June
How about the Palace Ballroom. Across from the Palace Kitchen, will easily hold your group. Catering can take care of arrangements and any menu you like. AT a recent event there, we had Tom Douglas serving up crab cakes for us.
Otherwise, almost any restaurant will close for you with a food minimum. I've talked to Cafe Juanita about it before. Do you have a budget in mind?