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Mr. Obama’s main event will be his remarks at a star-studded concert at the Nokia Theatre, marking 30 days until the election. Actor George Clooney and musical guests Stevie Wonder, Jon Bon Jovi and Katy Perry will entertain the crowd.

The president will wrap up his night at Wolfgang Puck’s WP24 restaurant, high above the L.A. skyline in the Ritz-Carlton hotel. With 150 people expected at a cost of $25,000 per person, that event alone will raise $3.75 million.

Mr. Obama’s trip, in total, will be three days, covering fundraisers in San Francisco and a rally in Columbus, Ohio, the state at the center of both campaign’s efforts.

The only official presidential business on the trip comes Monday in Keene, Calif., where Mr. Obama will designate as a national monument the home of Latino leader Cesar Chavez, the founder of the United Farmworkers Union, who died in 1993. Yet even that move has political implications. It resonates with some Hispanic voters, who supported Obama by a 2-to-1 margin in 2008 and favor him by a similar margin over Mr. Romney in this election, polling shows.

The weekend had Mr. Obama on a high, and he needed it after a lackluster midweek debate against Mr. Romney that gave fresh hope to the challenger’s bid. Even Robert Gibbs, a top Obama campaign adviser, conceded that Mr. Romney had delivered “a masterful, masterful performance.”

“But I don’t think Gov. Romney’s positions have changed, and fundamentally, I don’t think the campaign has changed,” Mr. Gibbs said on ABC’s “This Week.”

Meanwhile, Mr. Romney’s campaign unveiled a new television ad claiming Mr. Obama is not telling the truth when he says Mr. Romney wants to cut $5 trillion in taxes. The campaign has not said where the ad will run.

Mr. Obama’s campaign is also running a new TV ad called “Dishonest,” which carries on the post-debate theme that Mr. Romney grossly misrepresented his own positions as well as Mr. Obama’s on taxes. Online videos were posted by the campaign with the mantra “Romney won’t tell the truth” about Medicare, energy, taxes and more.