The dates for two congressional hearings were wrong in yesterday's Style section. Ed Asner, Richard Dreyfuss, Paul Winchell and Henry Heimlich testified yesterday before the House Science and Technology subcommittee on natural resources. Jack Valenti, William Shatner and Marvin Goldman are to testify today before the Senate subcommittee on investigations.

As usual, celebrities attract attention on Capitol Hill. Tomorrow, Ed Asner, Richard Dreyfuss, ventriloquist Paul Winchell and Henry Heimlich of Heimlich maneuver fame will be in town to testify before the House Science and Technology subcommittee on natural resources, agriculture research and environment. They are coming as part of Africa Tomorrow and will testify on long-term solutions for the African hunger crisis.

The following day Motion Picture Association of America President Jack Valenti will lead a group that will testify before the Senate subcommittee on investigations on how drugs are portrayed in films. Testifying with Valenti will be actor William Shatner; Marvin Goldman, former president and chairman of the board of the National Association of Theater Owners; and Richard Heffner, chairman of classification and rating administration of MPAA. Bullets Star Gets Suited

Manute Bol, the Bullets' 7-foot-6-inch rookie, is not an easy man to fit. The Sudan native weighs 205 pounds. He wears a 15 1/2-collar shirt with 43-inch sleeves and has a 32-inch waist and a 46-inch pants inseam.

In these frustrating days of average-sized clothing, it's hard for nearly anyone to get a comfortable fit in many men's stores. Bol, however, can't just walk in and buy off the rack. Bullets travel in sports coats, and Bol showed up last week at Raleighs at Landover Mall to get one. Raleighs contends it can fit anyone, so Bol was there to test the advertising. Needless to say, the store didn't have his sizes in stock, but store personnel did order a sports coat, a suit and several shirts, and promised quick delivery. Latest on Who's In, Out

M, the slick Fairchild Publications life-style magazine for "the civilized man," has published still another article on Washington power, with some of the city's obvious power brokers -- such as Robert Strauss, George Stevens Jr. and Edward Bennett Williams -- listed. Marion Barry told the magazine he'd rather be mayor of Washington than a Cabinet secretary or U.S. senator. Barry modestly said, "People love what I'm doing because I'm able to walk with kings and not lose the common touch."

The author of the piece, Susan Watters, has offered the Washington "ins" and "outs" list to consider. The "ins" includes Sen. Robert Dole, White House chief of staff Donald Regan, the Redskins' John Riggins, ABC's Sam Donaldson and Ted Koppel, New Republic owner Martin Peretz, St. Albans School for Boys and Galileo's restaurant. The "outs" are Sen. Ted Kennedy, Zbigniew Brzezinski, Redskin Joe Theismann, U.S. News & World Report owner Mort Zuckerman, Dominique's restaurant and Georgetown Prep. Just wait until Watters tries to get a table at Dominique's. End Notes

French author Francoise Sagan, who was strickened by altitude sickness on a trip to Colombia, is in intensive care in a Paris hospital. The hospital reports that she is improving and has regained consciousness and that her respiratory troubles are regressing . . .

Mayor Marion Barry is beginning to gather his stars for the city's New Year's Eve party. After the midnight fireworks at the Old Post Office, James Brown will be performing for the crowds outside while the ageless Cab Calloway will be inside . . .

The president and Nancy Reagan have donated the bronze statue of the Black Stallion to be auctioned at the Horse Show Friday at the Capital Centre. Entitled "Cass Ole," the statue was given to them by artist Billy Saathof. Proceeds from the auction will be given to the National Federation of Parents for Drug-Free Youth, of which Nancy Reagan is the honorary chairwoman . . .

Jesse Jackson and New York Gov. Mario Cuomo can legitimately wear green next St. Patrick's day. Irish American, a new magazine, has named the two in its list of the top 100 Irish Americans -- Jackson because he spoke out for peace in Ireland, and Cuomo because he understands ethnic groups. Most politicians do. The best choice, however, was the Peck's Bad Boy of Tennis, John McEnroe, whose temper tantrums, particularly when directed at English line judges at Wimbledon, give him a "high rating on his Irishness."