On Saturday and Sunday, August 15th and 16th, unfold your lawn chair, unpack the picnic basket, and settle in for two sunny afternoons of classic jazz. It's Jazz at the Mansion, Morris-Jumel's annual outdoor celebration of America's most original art form. Brought to you by jazz legend Marjorie Eliot and Parlor Entertainment, Jazzfest Weekend will have you tapping your toe, nodding your head, and feeling, for a few hours at least, fancy free. The jazz kicks off each day at 2 p.m. and lasts till 6. Attendance is free, and no registration is required. For more information, call 212-923-8008.