Patterson Library, 1167 Rte. 311 Patterson, NY. Enjoy a wonderful musical evening with The Mad Hatters. This menâ€™s chorus group will wow you with their a cappella song renditions. Hear them perform in barbershop, Broadway, doo-wop, and other fun musical styles. Registration preferred, walk-ins welcome if space allows. To register or for more information, visit us online at www.pattersonlibrary.org and click on calendar or call845-878-6121 x10. Free program.