But is Campo de Bocce a buffet, as OP requested?
For OP these are the ones that I can find:
Basil Leaf, 501 Hartz Ave, Danville, (925) 831-2828
Stixx, San Ramon Marriott, (925) 244-6114
Sweat Tomatoes, 4501 Hopyard Road, Pleasanton, (925) 463-9285
Divan Indo-Pak Cuisine, 2005 Crow Canyon Pl, San Ramon, (925) 275-0890
And my favorite:
Tomi, 476 Sun Valley Mall, Concord, (925) 689-2888
Yes, their brunch is buffet except for omelet station and prime rib station.
Also, the first 90 minutes your cocktails are included in the buffet price. Mimosas, champagne cocktails, bloody mary's, etc...