Howl-O-Ween Blessing of the Pets Drive-Thru, Sleepy Hollow UMC, 3435 Sleepy Hollow Road, Falls Church. Sunday, October 29 from 2:00 p.m. until 4:00 p.m. Treats for your pets and your children. For more information, call 703-534-6461 and leave a message. In the event of inclement weather, the event will be canceled.