ROCKPORT — The Coastal Dance Association, a non-profit organization formed to provide the local area with contra dances, will present a special dance at 8:30 p.m. Friday, July 20, at Simonton Corner’s Community Hall. Wild Asparagus, a four-person band from western Massachusetts, will provide the music. The band draws on music from New England, the British Isles and Canada, as well as classical sources. Admission of $5 to defray the cost of the hall and band will be charged. Beginners will be welcome. Farnsworth tours