Wednesday has been declared Folger Theatre Day by Mayor Marion Barry. The honor will be celebrated at the second annual arts reception, hosted by the theater that day from 6 to 8 p.m. for members of the arts community . . . The Source is selling raffle tickets to raise money for the Warehouse. The $1 tickets buy a chance for 13 prizes, including a trip to Hollywood. Call 462-1073 . . . The National has named two women to its board, Rose Narva of the Hay-Adams Hotel and Betty Wright, wife of Rep. Jim Wright (D-Tex.) . . .

Arena Stage is sponsoring a discussion on the "history and impact of spiritual and gospel music" tonight at 8 at the Nineteenth Street Baptist Church. Lee Breuer, director of "The Gospel at Colonus," will talk, along with Pearl Williams Jones of the University of the District of Columbia, and featured singers from the show, including the 35-member Wesley Boyd Gospel Workshop Choir, will perform. Call 554-9066 . . . Jazz pianist John Eaton will give a concert to benefit New Playwrights' Theatre next Sunday at the Embassy Row Hotel's Wintergarden. Tickets are $35. Call 232-4527 . . . Ford's Theatre reports that the planned visit from England's New Vic Company has been canceled because Actors Equity would not provide the appropriate permits. It has scheduled "Balletap USA," an all-dance show starring Maurice Hines and Mercedes Ellington, instead, starting Jan. 8.