On Saturday, December 7 and Sunday, December 8, join Friends Of Princeton Open Space (FOPOS) between 12 and 4 p.m. for a Holiday Open House at Mountain Lakes House, 57 Mountain Avenue.

View the FOPOS annual “Perspectives on Preservation Photo Exhibition,” enjoy complimentary refreshments, and stroll around the Christmas tree. Free. RSVP requested at fopos.org/events-programs.