St. Louis Park, Minnesota (CNN) Sen. Amy Klobuchar's campaign canceled a Sunday evening campaign event after dozens of protesters took the stage and would not leave inside a high school gym in St. Louis Park, Minnesota.

Campaign manager Justin Buoen said he was "very disappointed," adding that Klobuchar was ready to meet with the protesters, who agreed to sit down with her and then changed their minds.

"We had a negotiation and had an agreement with the organizers of the protest to meet with the senator on site. She was in the room ready to meet with them and then they changed the terms and decided that they didn't want to meet with her," he said in a conference room. "Really wish that we would have been able to one, do the meeting, and listen to the protesters, but also have the event."

Family members of Myon Burrell, a Minnesota teenager who was sentenced to life in prison under then-County Attorney Klobuchar for murder, along with protesters affiliated with the Racial Justice Network, Minneapolis NAACP and others took the stage in Burrell's honor chanting "Free Myon" and "Black Lives Matter."

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