From left, former President Joe Biden, former President Barack Obama, former President George W. Bush and former President Bill Clinton, pose for a photo ahead of the dedication ceremony today at the Obama Presidential Center in Chicago. (AP Photo/Pablo Martinez Monsivais, pool)

Former President Barack Obama formally opened his presidential center in Chicago today with a call to defend democracy as three former presidents joined him on stage in an extraordinary event featuring politicians, A-list celebrities, athletes and other internationally known figures.

“I hope this center will serve as an affirmation of just how special, how precious our democracy truly is and remind us what we can achieve when we embrace our shared responsibilities as citizens,” the nation’s first Black president told the crowd.

Bono, John Legend, Christina Aguilera, Marc Anthony and Eddie Vedder took turns on the stage ahead of Bruce Springsteen and Stevie Wonder, who closed the show singing “Higher Ground” as the former presidents, world leaders and others danced along.

President Donald Trump was conspicuous both in his physical absence and by not being mentioned by any of the speakers or performers. Trump called the $850 million center a “total disaster” in a social media post in February.

Obama voiced his support for character, honesty, integrity, kindness, compassion and sense of duty, praising both Democrats and Republicans, including those he defeated.

Former President Barack Obama, back center, and former first lady Michelle Obama, right, arrive on stage with their daughters, Sasha and Malia Obama, during the dedication ceremony today for the Obama Presidential Center in Chicago. (AP Photo/Jeff Roberson)

“Every president here today, as different as we are, has tried our best to uphold values that John McCain and Mitt Romney believed in no less than I did,” Obama said. “It is our greatest inheritance.”

Reflecting on his arrival in Chicago in 1985 as an untested political organizer, he said he could not have built the Obama Presidential Center anywhere else. He met his future wife Michelle nearby, their wedding reception was within walking distance, his children were born in the neighborhood and he launched his first candidacy not far away.

“It’s an expression of thanks, an acknowledgment that so much of what I hold most dear I owe to the people of this city and the people of the surrounding neighborhoods,” Obama said.

The Obamas and their daughters shared the stage with former presidents Joe Biden, George W. Bush and Bill Clinton along with former first ladies Jill Biden, Laura Bush and Hillary Rodham Clinton. Former Vice President Kamala Harris and many other leading Democrats were in the audience.

Michelle Obama spoke directly to her husband when she stepped up to the podium. “Eight years in the crucible and not once did you melt in the heat. Not once did you let it harden you.

Former President Barack Obama, right, shares a laugh with former first lady Michelle Obama, left, on stage during the dedication ceremony today for the Obama Presidential Center in Chicago. Behind them are former President Bill Clinton and former First Lady Hillary Clinton. (AP Photo/Jeff Roberson)

“Instead, you used it to reveal your truest essence,” she said. “Your stubborn optimism and unflinching courage. Your dazzling brilliance and unpretentious decency. Your ferocious work ethic and absolutely unshakable moral fiber. And to do it all as a first.”

She ticked off highlights from her husband’s eight years in office, including ordering the raid that led to the killing of Osama bin Laden, “standing up for marriage equality” and “listening to science.”

“And you did it all with such grace and class and cool,” she said. “You made the hardest job in the world look like a walk in this beautiful park.”

Obama appeared to wipe away a tear as she praised him.

Michelle Obama also referenced the current “anxious and divisive times” and warned against being cynical or complacent as “everything feels so upside down.” She pitched the center as “a respite from all that.”

Former President Barack Obama speaks during the dedication ceremony today for the Obama Presidential Center in Chicago. (AP Photo/Jon Cherry)

Jennifer Hudson sang the national anthem and Aguilera delivered a rousing rendition of “What a Wonderful World.” Pearl Jam’s Vedder, joined by Chicago teenagers in the nonprofit Guitars Over Guns program, sang an original song called “Better Believe,” written just for the dedication.

Legend sang “Someday We’ll All Be Free” and was joined by the rapper Common and Uniting Voices Chicago for their Academy Award-winning song “Glory.”

Bono, who said he was representing the Irish, joined with The Edge in singing the U2 song “City of Blinding Lights.” The Roots served as the house band. And Springsteen sang “Land of Hopes and Dreams” before turning to the Obamas and saying “I love you.”

Wonder sang “All I Do” and “Signed, Sealed, Delivered (I’m Yours)” before the grand finale, joined by the performers who preceded him.

The VIP crowd included several potential 2028 Democratic presidential candidates; civil rights leaders Andrew Young and Al Sharpton; Oprah Winfrey; comedians David Letterman, Conan O’Brien and Stephen Colbert; actor Tom Hanks; tennis legend Billie Jean King and Chicago Cubs Chairman Tom Ricketts.

Former world leaders in attendance included former German Chancellor Angela Merkel and former Canadian Prime Minister Justin Trudeau.

The three-hour invite-only celebration included commentary from a nearby park where thousands gathered, and it was livestreamed to many more. It kicks off a weekend of events as the center opens to the general public on Juneteenth.

“This is not a monument to the Obamas,” said Valerie Jarrett, the Obama Foundation’s chief executive and former Obama top adviser. “This is a tribute to all those who made this journey possible.”

The opening, like the ribbon-cuttings of other presidential libraries over the years, had a heavy focus on accomplishments. This former president also expressed some regrets — such as the increase in political polarization during his two terms. “It’s one of the few regrets of my presidency — that the rancor and suspicion between the parties has gotten worse instead of better,” Obama said in his final State of the Union.

“Some of the exhibits reflect unfinished business,” Obama said today. “In some cases, my own shortcomings and mistakes.”

General admission tickets for the center are sold out through the end of October. More than a million visitors a year are expected at the nearly 20-acre campus.

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Associated Press writer Mike Catalini contributed to this report from Washington, D.C.