UFC Freedom 250 is expected to begin at 9 p.m. ET after organizers delayed the event by one hour due to threatening weather conditions in Washington, D.C.
The outdoor fight card, staged on the South Lawn of the White House, faced uncertainty throughout Sunday as meteorologists warned of thunderstorms in the area.
However, updated forecasts later in the evening offered a more optimistic outlook for fans and organizers.
The event coincides with President Donald Trump's 80th birthday and is being marketed as part of the festivities commemorating America's 250th anniversary.
The seven-fight card is expected to run approximately four hours once action begins.
The main event features a lightweight championship unification bout between reigning champion Ilia Topuria and interim titleholder Justin Gaethje.
The co-main event will determine an interim heavyweight champion, with former two-division titleholder Alex Pereira facing former interim heavyweight champion Ciryl Gane.
