The attack, which shut down the capital’s airports for several hours, appeared to be the biggest wave of strikes on the city since the start of the war.
More than 500 guests are expected to gather at the Obama Presidential Center for the celebration, which will include performances by Stevie Wonder, Bruce Springsteen and Jennifer Hudson, among others.
With an initial agreement signed by both sides, oil could soon flow again through the Strait of Hormuz. But prospects for a long-term deal remained murky as talks on tougher issues loomed.