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...