Jazz veteran Cab Calloway, soul singer James Brown, bluesman Bill Harris and a number of other musical acts will hi-de-hi in the new year for Washington, Mayor Marion Barry announced yesterday.

The event, the third such annual celebration at the Old Post Office Pavilion, will feature a fireworks display for the first time, as well as the lowering of a replica of the 1986 "Love Stamp" from the clock tower after midnight.

"We will put the glitz in '86," said Barry at a press conference inside the Pavilion at 12th Street and Pennsylvania Avenue NW. The event, sponsored by many local businesses, is expected to draw some 100,000 persons. "It'll be the biggest and the best yet," said Barry.

Joining headliner Calloway (and his daughter Chris) inside the Pavilion during the 8 p.m. show will be guitarist Harris, the Dirty Dozen Brass Band, the D.C. Jazz Orchestra and the LaVerne Reed Dancers. Funkster James Brown will lead the entertainment outside, with entertainment by Willie Colon, the Del Fuegos, Experience Unlimited and On Beyond Zebra. Richard Bray's B.B. Big Band and other, as yet unannounced bands playing 1920s music will play at the Shops at National Place across the street starting at 6 p.m.

Radio station WWRC-AM's Felix Grant will lead the ceremonies inside the Pavilion (broadcast live by WWRC) and WKYS-FM's Candy Shannon and Melvin Lindsey will conduct the outside activities (broadcast live by WKYS). Giant television screens will beam the inside festivities to those outside and vice versa.

Although all shows are open to the public and free of charge, those planning to attend the Calloway show inside will have to make reservations. Details on how to secure reservations have yet to be worked out, according to the mayor's office, but an announcement is expected soon. Metro service will be extended until 2 a.m. for the occasion.