Welterweight champion Sugar Ray Leonard will announce his decision on continuing his boxing career Nov. 9 at the Baltimore Civic Center, Mayor William Donald Schaefer said yesterday.

Leonard underwent surgery last spring to repair a detached retina in his left eye, an operation that forced the cancellation of a bout with Roger Stafford.

Leonard made his debut as a professional boxer on Feb. 5, 1977, at the Civic Center.

"It's a bit of nostalgia," said Louis J. Grasmick, who is in charge of the sale of tickets and the coordination of the event.

The event will be called, "An Evening With Sugar Ray Leonard," and will be open to the general public. Some of Leonard's celebrity friends will be present.

Reporters and fans will be charged admission. Proceeds from the sale of $1 and $2 tickets will go to the Mayor's Blue Chip-In Program for Summer Jobs for Youth . . .

Larry Holmes will defend his World Boxing Council heavyweight championship against Randall (Tex) Cobb on prime-time television either Monday night, Nov. 22, or Friday night, Nov. 26, promoter Don King said yesterday. King said ABC will televise the fight Nov. 22 if the National Football League strike is still on and Nov. 26 if it isn't. No site has been set.