The rally that was scheduled to start at noon ended at around 1:30 p.m. Saturday afternoon (1730GMT), Boston Police Department declared on Twitter. "Hundreds of others danced in circles and sang, 'Hey hey, ho ho".
Trump's messages have fueled the escalating rhetoric from "alt-right" figures and white supremacists across the United States and prompted local and federal law enforcement officials to warn about the potential for more violence in the coming days.
"It's joyful", described one MSNBC reporter about early, occasionally dancing counter-protesting crowds this morning. "I've never seen so many people looking - nearly looking - for confrontation". The situation quickly calmed.
Police confined a small group of "Free Speech" protesters to the Parkman Bandstand on historic Boston Common as they blocked off the massive counter-protests, CBS Boston reports. Some were for assaulting police officers. The handful of rally attendees gathered beneath a pavilion near the center of the Common, surrounded by metal barriers and dozens of police.
He continued to applaud the many protesters in Boston who came out against "bigotry and hate".
He says he can't attend the Boston rally because of what he calls outstanding legal issues stemming from the Charlottesville rally.
"I definitely wouldn't associate myself with the KKK or any white supremacist".
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"I'm a black woman living in Roxbury", Monica Cannon, a Black Lives Matter Boston activist said.
While the free speech event has concluded, counterprotesters are still swarming Boston.
Plans for the Boston rally, which organizers said was not about white supremacy or Confederate monuments, were almost scrapped following the violence in Charlottesville. At times, they chanted "Hey hey, ho ho, white supremacy has got to go" and "black lives matter".
However, Thomas Robb, national director of the Knights of the Ku Klux Klan, told the Herald he doesn't believe the members will be disruptive, and had nothing to do with the violent protests in Charlottesville.
Boston Mayor Marty Walsh briefly joined the crowd of thousands assembling for the march. "The courts have made it abundantly clear". But they don't have the right to create unsafe conditions.
"We are a coalition of libertarians, progressives, conservatives, and independents and we welcome all individuals and organizations from any political affiliations that are willing to peaceably engage in open dialogue about the threats to, and importance of, free speech and civil liberties", the statement on the movement's Facebook page reads. "In return, they must respect our city". The organizers of the controversial rally claim that they are not white supremacists. The incident triggered nation-wide protests against right-wingers, and triggered or sped up the dismantling of Confederate monuments in a number of cities.