Peggy Mann, the author of the tough anti-marijuana book "Marijuana Alert," autographed copies of her work at a reception in the Russell Senate Office Building Tuesday. The book, with a forward by Nancy Reagan, is in its third printing. Among the guests at the reception were Sen. Paula Hawkins, chairman of the Senate Subcommittee on Alcoholism and Drug Abuse, and Rep. Charles Rangel, chairman of the House Select Committee on Narcotics Abuse and Control . . .

Columnist Art Buchwald kept up a constant patter behind the bar mixing and handling drinks like a master at the Women's Campaign Fund fundraiser Tuesday at Powercourt in the Phoenix Park Hotel. Buchwald's only problem was that there were too many other celebrity bartenders in his way in the small space behind the bar, including former Redskin Larry Brown, former State Department spokesman Hodding Carter and political consultant Doug Bailey. The fundraiser was also a victory party for Vermont Gov. Madeleine Kunin, Rep. Jan Myers and Arlene Violet, the Rhode Island nun who became her state's first woman attorney general . . .

There always seems to be a considerable amount of unpublished music from famous personalities, and now FBI agents in Florida have recovered a tape of unpublished Beatles music that might be worth millions. Michael Keith Reibel of Boca Raton, a former New Jersey recording studio employe, was charged Tuesday with the interstate transportation of stolen property. The tape includes private recordings of music and conversations of the Beatles . . .