Gibson disputed the group's classification as a hate group.
Riana Goren, an analyst with the Anti-Defamation League, told HuffPost that discussion about confronting counter-protesters has been taking place online "for weeks".
Eder Campuzano was bloodied Saturday afternoon but said in a Tweet published on the newspaper's website that he was "okay" and was going to get evaluated. At one point, authorities deployed "flash bang" devices to break up the feuding parties.
It has drawn hundreds of supporters and counter-protesters.
As the far-right Patriot Prayer and Proud Boys groups marched in the streets for an event dubbed Freedom March, hundreds of police in riot gear rushed the counter-protesters, firing flash bangs and projectiles with pepper spray.
Police eventually dispersed the downtown area after demonstrators threw rocks and bottles at them. There were some arrests and reported injuries but it wasn't immediately clear how many of either occurred.
Gibson told supporters they had to be united. Two previous events ended in bloody fistfights and riots, and one counter-protester was sent to the hospital with a skull fracture. "Our country is getting soft".
Counter-protesters prepare to clash with Patriot Prayer protesters during a rally in Portland on Saturday.
On the event's Facebook page, organizers said they "make no apologies for the use of force in keeping our communities safe from the scourge of right-wing violence".
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A weapon is confiscated by police before the rally. Police have also announced they will not respond to non-emergency calls in the city due to the demonstration in a Portland park.
This time, Gibson changed the venue from a federal plaza outside US District Court to a waterfront park so some of his OR supporters could carry concealed weapons as they demonstrate. Portland police later said "protest officers seized firework mortars", while some activists on the left accused police of shooting "stun grenades".
The peaceful, right-wing Patriot Prayer rally quickly turned chaotic as the group began to march along the waterfront at Tom McCall park - the site of the rally.
Police promise a heavy presence as previous encounters between the two groups have turned violent.
A broader counter-protest organized by a coalition of labor unions, immigrant rights groups and artists also will gather at City Hall.
This weekend's clashes were the most recent of several this year in the city as right-wing groups converged, met by far-left protesters, including members of the left-wing terrorist organization Antifa.
The Patriot Prayer, the organizing group which put the rally together, is led by Joey Gibson, who described his heritage as Japanese.
Police in Oregon's largest city were bracing Saturday for the latest dueling political rallies in Portland, asking people not to bring weapons and warning that screening checkpoints and bomb-sniffing dogs would be on hand.
Gibson has said that he won't stop bringing his followers to Portland until they can express their right-wing views without interference. The protest was organized by the far-right groups Patriot Prayer and the Proud Boys, who do not explicitly refer to themselves as "alt-right" or white supremacist groups, but have been linked to the white supremacist movement.