A colorful sea of people crowded into the harbor-front field and oak-filled playground area at Mt. Pleasant’s scenic Alhambra Hall on Sunday afternoon. The occasion was the 22nd annual Blessing of the Fleet and Seafood Festival — a popular event that regularly draws thousands of locals with the goal of wishing local shrimpers a safe and prosperous season. It was a warm and sunny day. Cars were lined up and down the Old Village streets for blocks. Just about everyone was clad in big hats, sunglasses, shorts, and boat shoes. A breeze off the water only cooled things off slightly. “It’s a beautiful day … but it’s most beautiful in the shade,” I overheard someone say. (They were situated under a big tent with their kids and friends.) A dozen local restaurants set up around the edges of the yard, selling an assortment of specialties — from buffalo- and bacon-wrapped shrimp to dirty rice, Cajun fries, and crab cakes. (A portion of the proceeds benefited East Cooper Meals on Wheels.) Not surprisingly, the icy lemon slushies were also mighty popular. Late in the afternoon, a shag dancing contest took place in front of the main stage, as veteran beach music and oldies act East Coast Party Band played through all the standards shag favorites. Dressed for the occasion, the eight-piece ensemble looked all coastal in their matching yellow polos and plaid Bermuda shorts. Someone’s little girl stood in as guest tambourinist in the last set. The winning couple led the crowd through the band’s lengthy, upbeat “beach medley,” featuring snippets of such hits as the Tams’ “What Kinda Fool,” Bruce Channel’s “Hey Baby,” and the Embers’ “I Love Beach Music.”