If you can't make it to Cambridge, try Wareham (almost Cape Cod) the week before. April 28, 2001 (Saturday) 7 to 9 pm: Roger Nicholson joins Lorraine and Bennett to play for diners at the Rosemary Inn, 330 Main St., Wareham, MA, 508/295-5369April 29, 2001 (Sunday) 1 p.m.: Bennett and Lorraine join English dulcimer player Roger Nicholson for an afternoon of workshops (singing, harp, guitar, autoharp and dulcimer) followed by an Italian buffet dinner and informal music making at the Rosemary Inn, 330 Main St., Wareham, MA, 508/295-5369 (reservations required)