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

“I hope this centre 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,” Obama told the crowd.

U.S. 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 US$850 million centre 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.

“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, Obama said he could not have built the center anywhere else. He met his future wife Michelle nearby, their wedding reception was within walking distance, his children were born in the neighbourhood 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.

Michelle had some emotional words for her husband

Obama and former first lady Michelle Obama 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 was also in attendance.

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.”

A-list entertainers sang inspirational anthems and protest songs

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. 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)” as the Obamas smiled, danced in their seats and sang along. Wonder then brought other performers back on stage to close with a rousing rendition of “Higher Ground.”

Those at the event 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 Germany Chancellor Angela Merkel and former Canadian Prime Minister Justin Trudeau.

Event kicked off weekend of celebration

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

“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 Thursday. “In some cases, my own shortcomings and mistakes.”

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

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

Scott Bauer, The Associated Press