The 8th (not quite) annual Pet Rock By-The-Sea brings local people, local musicians, local vendors and local artists together to raise funds for local animal shelters. This year's event includes music by Boston Music Award winners Rippopotamus, Erinn Brown Trio and Eric Reardon. You'll also find local artists, beer tasting, snacks, raffles and merchandise all to benefit the MSPCA Northeast Animal Shelter.