Downtown Ithaca Architecture highlights the significant historic gems that illustrate chapters in the history of the city. See how preservationists and developers have worked together to save these key components of Ithaca’s past. Tour starts at 4:00 p.m. at the Tompkins Center for History and Culture, 110 N. Tioga St., Ithaca, NY, and runs about an hour. Tickets: $10. Register at: http://www.historicithaca.org/tour/. Sponsored by the Marriott Downtown Ithaca Commons and the Tompkins County Tourism Program.