Here are just a few of the area's horrific Halloween happenings:
* Congressional Cemetery holds a Halloween gala beginning at noon Saturday, complete with ghost-story tellers, and a Sousa band concert. Picnics are welcome; soft drinks and popcorn will be for sale. The cemetery is at 18th and E streets SE. 543- 0539; free.
* Saturday is Potomac's Fourth Annual Potomac Day, featuring a Halloween for Pets and Pet Show at 12:30. There's no entry fee for the event and there'll be free candy bars for anyone in costume. Contests include best pet costume and best people/pet costume. Other activites include a bull roast at 12:30 with free roast beef sandwiches, soda, cotton candy and popcorn; and a community flea market and craft sale starting at 10. It all takes place in the Potomac Village at the intersection of Falls and River roads. 299- 2170.
* There'll be dramatic readings of Edgar Allen Poe's "The Tell Tale Heart" and "The Black Cat" at 12:30, 1:30, 2:30 and 3:30 Saturday and Sunday at the Poe House, 203 Amity Street, Baltimore. $1, 50 cents for children under 12. 301/396.7932.