Vice President Biden will travel to New York City on Thursday to celebrate the Supreme Court's ruling that legalized same-sex marriage.
Biden will speak at an event sponsored by the gay-rights group Freedom to Marry. The gathering will "celebrate success in winning marriage nationwide and the triumph it represents for America," the group said in a statement.
Freedom to Marry praised Biden as an "longtime champion of the LGBT community."
The vice president's popularity among gay-rights groups soared after he expressed his support for same-sex marriage in May 2012.
President Obama had not yet announced his support, and, when he did so, he admitted that Biden's comments had forced his timing.
The Supreme Court decided on June 26 that same-sex couples have the right to marry under the Constitution, making the practice legal in all 50 states.
Biden hailed the Supreme Court's Obergefell v. Hodges ruling on Twitter when it was handed down.
"All marriages at their root are about love. In America, our laws now recognize that simple truth. #LoveWins today & we couldn't be prouder," he tweeted.