Fall cheer is in the air. Rowdy Hall’s Oktoberfest returns with prix-fixe, German dinners and other delights (September 17-October 3). Hallockville Museum Farm’s 41st annual Country Fair & Craft Show offers pony rides to food trucks (September 17-18). Attend East Hampton Historical Society’s Fall Festival at Mulford Farm (October 1; rain date October 2). 10 Main Street, East Hampton, N.Y., 11937. 6038 Sound Avenue, Riverhead, N.Y., 11901. 10 James Lane, East Hampton, N.Y., 11937.