Weekly Open Houses COLUMBIA CAMPUS Tuesdays and Thursdays – 8:30 am – 11:00 am 790 Columbia Rd. LOWER MILLS CAMPUS Wednesdays – 8:30 am – 10:30 am 2222 Dorchester Ave. NEPONSET CAMPUS Tuesdays – 8:00 am – 9:00 am 239 Neponset Ave.