On Friday January 20, 2017 from 10:00 AM to Noon the “Bridge Together Golden Gate” event will take place on The Golden Gate Bridge, with as many as 3,000 people linking up on the San Francisco side (East Sidewalk) of the Bridge and potentially through the parking lots.
This is a planned event that has secured all necessary permits, not a disruption-type protest, and they are explicitly asking that no one interfere with the flow of traffic on the Bridge.
All of the parking lots adjacent to the Bridge will be closed for the event, so use mass transit or rideshare if you’re going.