SAN FRANCISCO (Reuters) – San Francisco braced on Friday for a weekend of protests, including a rally by an Oregon-based group that local leaders labeled “white supremacist” as the city’s mayor urged residents to boycott the event.

The demonstrations planned for Friday, Saturday and Sunday across the Bay Area raised concern among San Francisco police and elected officials two weeks after right-wing activists, including neo-Nazis and the Ku Klux Klan, fought with anti-racism protesters in the streets of Charlottesville, Virginia.

A woman was killed at that “Unite the Right” rally when a man thought to have neo-Nazi sympathies drove his car into a crowd of counter-protesters. Nineteen other people were injured.

The Saturday event is billed as a “free speech” rally, but critics say the Oregon-based organizers, Patriot Prayer, is a white nationalist group, pointing to plans that may include the far-right Oath Keepers providing armed security. The group has decried racism and neo-Nazis.

Last weekend, 33 people were arrested in Boston as tens of thousands of demonstrators took to the streets to protest a “free speech” rally featuring far-right speakers.

In San Francisco, city officials including Mayor Ed Lee had lobbied the National Park Service to deny a permit for Patriot Prayer to hold its event at Crissy Field, which is under federal control as part of the Golden Gate National Recreation Area.

When that permit was granted on Wednesday, Lee told residents of San Francisco to essentially boycott the rally.

“I ask our public and our residents of the San Francisco Bay Area to honor our request to not dignify people who are coming in here under the guise of patriot and prayer words to really preach violence and hatred,” Lee told a press conference.

The mayor urged locals to instead attend city-hosted events on Friday and Saturday that he said would focus on “inclusion, compassion and love rather than hate.” The first of those is a “Unite Against Hate” rally planned for noon local time (1900 GMT) in a downtown plaza on Friday.

U.S. House Democratic leader Nancy Pelosi, in a written statement, slammed the Patriot Prayer gathering as a dangerous “white supremacist rally.”

Left-wing counter-protesters, meanwhile, were planning a march to Crissy Field, where police were concerned a confrontation could erupt. San Francisco-based artist and designer Terrence Ryan, known professionally as Tuffy Tuffington, has put out a call on Facebook for canine owners to litter the field beginning on Friday with dog poop ahead of the Patriot Prayer event.

Patriot Prayer founder Joey Gibson said in a video message posted on the group’s Facebook page it was “absolutely not” white supremacist, adding he is a person of color.

“What I’m trying to do is bring people together who believe in freedom, who believe in love, believe in peace and believe in free speech,” Gibson said.

The nonprofit Southern Poverty Law Center, which tracks hate groups, does not classify Patriot Prayer in those terms and reported on its website that Gibson denounced white supremacists and “neo-Nazis” at a rally in Seattle earlier this month.

Participants in the Patriot Prayer will not be allowed to brandish firearms, the National Park Service said.

On Sunday, conservative activists planned a so-called “No to Marxism” rally in nearby Berkeley, an event that left-wing groups were also expected to protest. However, city of Berkeley officials on Thursday denied that group’s request for a rally permit.

An organizer for the planned Berkeley rally could not be reached for comment.