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President Obama won’t arrive on Martha’s Vineyard for another couple of weeks, but boldfacers on the island are already kicking back. Lawyer Alex MacDonald and his wife Dr. Maureen Strafford hosted a sunset soiree Sunday at their Chilmark spread. Singer Tom Rush entertained 150 or so guests, Harvard Law professor Alan Dershowitz and wife Carolyn Cohen, Harvard Business School professor Rosabeth Moss Kanter , Seth Meyers’s in-laws-to-be Tom and Joanne Ashe, “Sleepless in Seattle” producer Gary Foster, venture capitalist David Fialkow, and restaurateur Patrick Lyons. Obama, whose family vacationed on the Vineyard in 2009, 2010, and 2011, is due to arrive with the first lady and their two daughters Aug. 10 and stay until Aug. 18. . .