Two of the plaintiffs who challenged California's ban on gay marriage wed in Los Angeles. Paul Katami and Jeff Zarrillo of Burbank, California, were among the plaintiffs that went before the US Supreme Court this year.
"So many others like us did not stand for being treated as second class citizens", said Mr Zarrillo.
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Security is to be enhanced around Windsor Castle during the Changing Of The Guard following the Westminster terror attack.
A cloudy start to the day with top temperatures of 18C (64F).
Immigration levels may need to rise, David Davis has said as he refused to commit to a cap on the number of EU citizens coming to the UK.