Dog walkers plan 'poop protest' at Crissy Field in San Francisco

SAN FRANCISCO -- Dog walkers are planning to protest a politically conservative free-speech rally by leaving pup poop at San Francisco's Crissy Field.

FULL LIST: Rallies and demonstrations planned for San Francisco, Berkeley

A Facebook page encourages protesters to let their dogs loose Friday and Saturday morning at the park near the Golden Gate Bridge and not pick up after them.

The page assures dog owners that they can come together Sunday to clean up the field of feces and "hug each other."

VIDEO: The group behind Saturday's lightning rod rally in SF

Portland, Oregon-based Patriot Prayer has a permit to host a 2 p.m. "freedom rally" Saturday at Crissy Field, despite the vociferous objections of San Francisco's Mayor Ed Lee and other Democratic leaders who say the group invites hate.

VIDEO: What to do if you're stopped by police at a rally

Patriot Prayer leader Joey Gibson says that his group doesn't harbor racist views and that hate groups are not welcome.

Click here for more information on the transit closures and alterations for this weekend.

Click here for a look back at stories and videos from recent protests.