Oyster fans will want to mark down August 5 on their calendars. That's the date of the Tavern On Rush Festival of Oysters. Come in anytime that day and get your oysters on the half shell without shelling out a lot of dough. They're only $1. You can also get Stone Oven Baked Oysters in Jalapeno Bacon or Lemon Garlic for $2 and $10 fried oyster baskets. Wash them down with $3 bottles of Guinness and $5 glasses of Costamolino Vermentino wine.