Holiday Tree Lighting, Upper Union Street, Schenectady. Free Event on Saturday, Nov. 25, 4 p.m., Trustco Bank, 1620 Union Street. Caroling, Brown School Bell Choir, Santa, Refreshments, Free Small Business Saturday and other giveaways. Free event. All are welcome. Also, the public is invited to visit businesses participating in Small Business Saturday all day long on November 25. 518 730-6896, .  www.upperunionstreet.com.