Crews set up for San Francisco's Outside Lands Music Festival

SAN FRANCISCO (KGO) -- One of San Francisco's biggest events gets underway Friday. Workers were in Golden Gate Park Wednesday setting up for this year's three-day-long Outside Lands Music Festival.

Outside Lands features three days of music, comedy, food and other attractions at the polo field.

This year's headliners include Mumford and Sons on Friday, The Black Keys on Saturday and Elton John on Sunday.

Click here to visit the festival's website and here to check out the full lineup.