Friends of Princeton Open Space Tree and Wildflower Walk - Sat. May 18 - Inst. Woods, 10 am (pre-register) Tree Walk - Sat. June 8 - Woodfield Reservation, 8 am (pre-register) View all Upcoming Events Photos About Us Founded in 1969, we are a non-profit, tax-exempt organization devoted to environmental protection and the preservation of open space in the Princeton, NJ area. Board of Trustees ...