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Sing with me: “There’s got to be a morning after….” If you thought The Poseidon Adventure was scary (Shelly Winters soaking wet!), then brace yourself for the Seventh Annual Cardboard Boat Regatta. It’s “Damn the staples, full speed ahead,” when boaters age 5 to 95 take to the water in homemade crafts built entirely with corrugated pulp paper by-products—no metal, wood, or plastic allowed. Both relay and obstacle courses will be run, though the first obstacle to overcome is one’s good sense. Of course, there will be prizes, including one for “Most Likely to Sink.” The big heave-ho begins at 1 p.m. Saturday during the Cardboard Boat Regatta Festival, from 4-10 p.m. today, 10 a.m.-10 p.m. tomorrow, and 10 a.m.-6 p.m. Sunday at Lake Accotink Park, 7500 Accotink Park Rd., Springfield. FREE. (703) 321-7081. (Dave Nuttycombe)