A free meal at one of Cambridge's better restaurants isn't available every day of the week, but Chinese New Year--Saturday, Feb. 8--seems as good a time as any. The Su-Shlang, among the top one or two Chinese restaurants in the area, is celebrating the arrival of the Year of the Rabbit with an afternoon of free Chinese pastry, including panfried dumplings, spicy noodles, chopped-meat buns and fried crullers. About 1,500 people are expected to pack the moderately-sized, home-decorated restaurant on the corner of Prospect Street and Broadway (about a 15 minute walk from Gund Hall on Broadway, or a five-minutes stroll from the Central Square subway exit up Prospect Street). Personality, I find most Chinese pastries sickly sweet and pasty, but the dumplings are excellent (a $1.95 value) and the noodles (in a watery rename source) are also good. No strings attached, 12 noon to 3:30 p.m.