The Gerrit Smith Estate National Historic Landmark (GSENHL), home of abolitionists Ann and Gerrit Smith, at 5304 Oxbow Road in Peterboro, will be open Saturdays and Sundays 1pm to 3 pm from June 1 to August 25. The exterior exhibits at the Smith Estate are open from dawn to dusk year round. The National Abolition Hall of Fame and Museum (NAHOF), site of the inaugural meeting of the New York State Antislavery Society in 1835, at 5255 Pleasant Valley Road, is open noon to 4 pm Saturday through...