HAPPENIN’ OTSEGO for MONDAY, APRIL 1 Chair Yoga in Richfield Springs HAPPY EASTER EXERCISE—2-3 p.m. “Choga Flow.” Chair yoga led by certified instructor Wanda Hunt. Cost, donation of 1 non-perishable food item for the Richfield Springs Food Pantry. Held each Monday. Richfield Springs Public Library, 102 West Main Street, Richfield Springs. (315) 858-0230 or visit https://www.facebook.com/otsegocountyOFA/ BLOOD DRIVE—Noon to 6 p.m. Worcester United Methodist Church, 111 Main Street, Worcester. RedCrossBlood.org…