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Familiar from their Sunday-brunch gigs at Cushman Market and Cafe in North Amherst and nighttime sessions at The Black Sheep, also in Amherst, the Mark Ricker/Jimmy Burgoff Duo has taken up residence this month at 30Boltwood, the restaurant in The Lord Jeffery Inn, where they’ve been performing a program of holiday favorites each Friday, 6:30-9 p.m. The duo features Ricker on nylon-stringed guitar and Burgoff on upright bass. The pair will play their two final dates Dec. 23 and 30. No cover.