If you’re wondering where all the butter and bivalves went, here’s a hint: the weekend-long Yarmouth Clam Festival kicks off today with attractions including carnival and horse-and-wagon rides, a parade along Main Street (starting at 6 p.m.) and music by standout roots, folk and country acts like The McCarthys, The Mutineers and Gunther Brown. Full schedule at clamfestival.com.