New Dinosaurs

The fossilized specimens of three newly discovered dinosaurs with strikingly birdlike features are on exhibit in "Feathers and Fossils: New Links in Dinosaur Evolution," at the National Geographic Society's Explorers Hall, 1145 17th St. NW (Metro: Farragut North). The exhibit, which features fossils of bipedal meat eaters, is open Mondays through Saturdays from 9 to 5 and Sundays 10 to 5 through Jan. 18. Admission to the exhibition is free. Call 202/857-7588.

Ho-Hos Alert

Weekend's annual calendar of holiday activities appears Dec. 3. If you would like us to include your holiday concert, parade or other event, send your notice by Nov. 19 to Ho-Hos, Weekend, The Washington Post, 1150 15th St. NW, Washington, DC 20071. Please include a description of the event, dates, times, an exact address, a telephone number (with area code) we can print and admission fees. Craft shows and religious services will not be included.

Horse Show

Top riders and horses from around the world will compete in jumping and dressage events at the Washington International Horse Show, Sunday through Oct. 31 at USAirways Arena in Landover. The sessions are Sunday from 10 to 10, Monday from 7:30 a.m. to 10 p.m., Tuesday through Thursday from 7:30 a.m. to 7 p.m. and 7:30 p.m. to 10 p.m, Oct. 29 from 7:30 a.m. to 5 and 7 to 10 p.m., Oct. 30 from 7 a.m. to 6:30 and 7 to 10 p.m., and Oct. 31 from 7 a.m. to 4:30 p.m. and 5 to 10 p.m. Tickets to evening sessions range from $18 to $42; daytime tickets range from $6 to $37. Tickets for Sunday and Monday sessions (one ticket good all day) are $18 and $37. Seniors and children 12 and younger may buy tickets for half-price (except box seats). Call Ticketmaster, 202/432-7328 (service charges); for information, call 301/840-0281.

Spooky Business

A Midnight Express Haunted Train, a Hall of Horrors Haunted House, a Teeny Scream for little children and other attractions are featured at the Six Flags America Fright Fest, weekdays from 4 to 10, and Saturdays and Sundays from noon to 10 through Oct. 31 (tickets for Oct. 30 and 31 must be purchased in advance). Admission is $31.99, children 48 inches or shorter $15.99. There is an additional $5 charge for Brutal Planet, a high-tech, ultra-scary haunted house (children must be accompanied by an adult). The park is in Largo, on Route 214 five miles east of the Beltway. Call 301/249-1500.

Join costumed interpreters and hear about the ghostly happenings and strange history of the historic sites in downtown Leesburg during the "Leesburg Hauntings" 90-minute walking tours, offered every 15 minutes from 6 to 9 Friday through Sunday. The tours are $10 ($5 for children 11 and younger) and start at the Leesburg Town Hall, Market and Wirt streets. Reservations are required. Call 703/777-0099.

Washington Storytellers Theatre presents "Ghosts Foreign and Familiar," Halloween stories of the supernatural for adults, Saturday at 8 at the Writer's Center, 4508 Walsh St., Bethesda. Tickets are $12, $9 for seniors and students. Call 301/891-1129.

`Rigoletto'

The Washington Opera opens its season with "Rigoletto," Verdi's riveting tale of innocence betrayed, Saturday at 7 and Thursday at 8 at the Kennedy Center Opera House, with eight more performances through Nov. 26. Tickets are $61 and up. Call 202/295-2400 or 202/467-4600 (TDD: 202/416-8524).

Dance by Clarke

Choreographer Martha Clarke's dance company performs her latest full-length work, "Vers la flamme," a dance-theater piece based on the short stories of Anton Chekhov and danced to the music of Alexander Scriabin and Sergei Rachmaninov, Friday and Saturday at 7:30 in the Kennedy Center's Eisenhower Theater. The subject matter is intended for mature audiences. Tickets are $22, $27 and $35. Call 202/467-4600 (TDD: 202/416-8524).

OUR PICKS

Film

With "Bringing Out the Dead," the satisfying fourth collaboration between screenwriter Paul Schrader and director Martin Scorsese, the world we know as "E.R." turns into an engrossing hell on earth, as ambulance driver Nicolas Cage seeks redemption and a few hours of untroubled sleep on the streets of New York. See review on Page 46. -- Desson Howe

Exhibit

Featuring 56 paintings of scenes from New England to Mexico, "Edward Hopper: The Watercolors" is the first major exhibition in four decades of the American realist's watercolor landscapes. At the National Museum of American Art, Eighth and G streets NW (Metro: Gallery Place/Chinatown). 202/357-2700 (TDD: 202/357-1729)

-- Michael O'Sullivan

Nightlife

Mary Cliff is one of Washington's unsung treasures. As a disc jockey on WETA-FM, she's been spinning records for almost 30 years, and her Saturday night program, "Traditions," is a rare local showcase for modern folk and ethnic music. WETA pays tribute to Cliff Sunday evening at the Birchmere, 3701 Mount Vernon Ave., Alexandria; 703/549-7500. The tribute will give way to a concert by stunning Cape Breton fiddler Natalie MacMaster, whose jigs and reels and aires can often be heard on Cliff's show. -- Eric Brace

Marine Corps Marathon

More than 21,000 runners are registered in the Marine Corps Marathon, which starts Sunday at 8:30 a.m. on Route 110 just south of the Marine Corps War Memorial. (Registration is closed.) The course circles the Pentagon, crosses Key Bridge and follows a loop from the Lincoln Memorial along Constitution Avenue to the Capitol, back along Independence Avenue to the Tidal Basin and on to Hains Point, and then crosses the 14th Street Bridge and returns to the Marine memorial, which the first male finishers are expected to reach around 10:45 and the first women around 11:15. The wheelchair marathon starts at 8:20 a.m., with the first finishers expected around 10:10. Spectators are welcome. Park in the Pentagon North and South lots (Metro: Pentagon) and take free buses to the memorial. The Rosslyn and Arlington Cemetery Metro stations are a short walk from the finish line. Call 800/786-8762 or 703/784-2225. Web site: www.marinemarathon.com.