The charges stem from a melee at the Pride festival where extremist Christian preachers waved signs with anti-LGBTQ messages and shouted matching rhetoric through a megaphone.
In response, a phalanx of pink-masked Pride supporters fanned out in front of them, carrying a giant black fabric screen to block them from celebrants' view.
Video footage shows the preachers becoming agitated, with at least one pushing against the screen throwing punches.
Footage also shows a man wearing pseudo combat gear slugging two of the counter-protesters in the face with a helmet.
The preachers, "yellow vests" and men wearing garb of the Canadian Nationalist Party, a far-right group, were escorted out of the park by police.
The violence has renewed calls for police and the city to crack down on hate groups. Police have also come under fire for what has been seen by some as an inadequate response to the chaos.
Vanderweide, the fourth to be implicated in the aftermath of June 15, is the sole anti-LGBTQ protester to face charges.
The Hamilton Queers Against Hate, a local advocacy network, has condemned the arrests of members of the queer community as "frivolous."
Others, including the Hamilton and District Labour Council, and a group of McMaster professors and students, have criticized the city's handling of the situation as well.
Mayor Fred Eisenberger says he hopes to meet with LGBTQ residents to address their concerns.
Meanwhile, regular "yellow vest" rallies outside city hall remain a sore spot for many local advocates and residents.
Rick Boswick, who says he agrees with "yellow vest" principles and noted his work with the Canadian Combat Coalition, filmed the protest at Gage Park.
He blames masked "antifa" organizers — which is derived from the word "anti-fascist" — for the violence.
Boswick, who lives in Toronto, was also at the courthouse to support Vanderweide. He said he believes in "responsible migration" but criticized current government policies. "Traditionally, immigration has been to benefit to the host country, and now they've obviously changed the places in which they get people."
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