Dirrty. SEE New England Sand Sculpting Festival What: Watch as more than 300 tons of sand are molded into massive beachside sculptures during this annual competition. Why: Bright, sandy day. When: Thurs. & Fri., 8 a.m.-6 p.m.; Sat., 8 a.m.-3 p.m. Where: Revere Beach, Revere Beach Blvd., Revere. EAT Bina on the Common Opens What: Stop by the downtown resto’s new Downtown Crossing outpost and pick up yogurt, granola, or coffee to start your day, or swing by for lunch and try a grilled portobello burger or homemade tortellini salad. Why: Perfect picnic pick-up place. When: Mon.-Fri., 8 a.m.-6 p.m.; Sat., 10 a.m.-5 p.m. Where: Boston Common, at Tremont & Boylston Sts. LEARN Fillet-a-Fish Class at Catch Restaurant What: Discover how to clean and successfully slice up a whole fish (from your fave farmers’ market). After your hard work, enjoy some wine and nibbles. Why: Scale it back. When: Sat., 11:30 a.m. Where: 34 Church St., Winchester. Reservations at 781-729-1040. EXPLORE ArtBeat Festival Davis Square What: Stroll Somerville and check out two stages of live music, 80 crafty vendors, and dance performances in the Somerville Theatre. Why: You’ve got the beat. When: Fri., 5-10 p.m.; Sat., 11 a.m.-6 p.m. Where: Elm & Holland Sts. STROLL Fit in Clouds Fold-Up Flats What: Toss these bendy ballets into your purse for end-of-the-night relief. The skimmers come in gold, black, and hot pink and fold up into a teeny pouch. Why: The dogs are barking. When: You’re feeling flat. Where: Passport, 43 Brattle St., Harvard Square (617-576-0900).