Just got back from there. A fairly small festival, more like a church bake sale, but with Serbian cuisine. Parking was easy.
Food was really good. Forgive the mangling of names, but I got a combo plate ($10) with a sausage (kobasce), stuffed cabbage leaves (sarma), steamed red potatoes and onions, and a salad of tomato, cucumber, and feta. The sarma were just fabulous. Also a plate of grilled beef rolls (cevapcici) that came with salad for $8. Cheese pastry, and a walnut torte, for $2 each.
Indoor seating and live music. Looked like most of the people there were of eastern European descent, but they were all kind and friendly.
Open until 9pm tonight, if you can make it out to Moraga.