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 politicians, 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 Bruce Springsteen and Stevie Wonder.

“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,” Obama told the crowd.

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 a sense of duty, praising both Democrats and Republicans, including those he defeated.