Bill Clinton is not giving away his daughter Chelsea’s hand in marriage for another three weeks. But he is going to get a little practice at the altar on Saturday, when he officiates at the wedding of Representative Anthony D. Weiner and Huma Abedin, a longtime aide to Secretary of State Hillary Rodham Clinton.

The ceremony will be at Oheka Castle in Huntington, N.Y., in the early evening.

Matt McKenna, a Clinton spokesman, told The Associated Press that Mr. Clinton would conduct the ceremony and was authorized to do so, but did not elaborate. Aides to Mr. Weiner, who represents Queens and Brooklyn, declined to comment.

Mr. Weiner, 45, has been a longtime ally of Mrs. Clinton. Mr. Weiner, who is Jewish, has also been considered one of the most eligible bachelors on Capitol Hill. Ms. Abedin, 34, who grew up in Saudi Arabia and is Muslim, was once featured in a Vogue fashion spread.

The two have been dating for about two years, and announced their engagement last summer, not long after Mr. Weiner decided not to mount another run for mayor of New York.