Former President Barack Obama, joined by three former presidents, celebrated the opening of his presidential museum in Chicago in an extraordinary event Thursday that brought together world leaders, A-list celebrities, athletes and other internationally known figures.

Bono, John Legend, Christina Aguilera, Marc Anthony and Eddie Vedder took turns on the stage ahead of planned performances by Bruce Springsteen and Stevie Wonder.

Obama and former first lady Michelle Obama and their daughters were seated on 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 was also in attendance.

President Donald Trump was not in attendance. He called the $850 million center a “total disaster” in a social media post in February.

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.

“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.”

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 there representing the Irish, joined with The Edge in singing the U2 song “City of Blinding Lights.” The Roots served as the house band.

The invite-only celebration was livestreamed and kicks off a weekend of events centered around the Obama Presidential Center, which opens to the general public on Juneteenth. Thousands more watched from a nearby park.

Those at the event included California Gov. Gavin Newsom, a potential 2028 Democratic presidential candidate; 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 Germany Chancellor Angela Merkel and former Canadian Prime Minister Justin Trudeau.

“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.”

Martin Nesbitt, chair of the Obama Foundation board, wore a tan suit in a joking nod toward the outfit Obama wore in 2014, drawing criticism over his fashion choice.

General admission tickets for the center are sold out through the end of October. But tens of thousands of people have already been offered a sneak peek of the nearly 20-acre campus on Chicago's South Side in Jackson Park.

The center, located near where Obama lived and began his political career, is expected to attract more than 1 million visitors annually. It is adjacent to the Griffin Museum of Science and Industry in the lakefront park, and not far from the University of Chicago.

The campus includes a towering museum that covers the political and personal realms of the nation’s first Black president and first lady, while public spaces include a branch of the Chicago Public Library, a playground and athletic center, basketball courts and a picnic area with grills.

The tower’s design is meant to depict four hands coming together in solidarity. Wrapped around one side are 5-foot tall concrete capital letters, an excerpt of Obama’s 2015 speech commemorating the 50th anniversary of the Selma-to-Montgomery march. It begins, “You are America.”