The Long Island Dahlia Society will hold a sale of exhibition grade dahlia tubers, Thurs, May 21, 8 p.m. in the HG Williams Community Center, Ritter Avenue, Massapequa. There will also be a dahlia basic class at 7 p.m. where free information on how to grow dahlias to perfection will be available. All are welcome and the admission is free. For information, visit www.LongIslandDahlia.com or call Joe at 631- 754-1002 in the evening or 516-832-3652 during the day.