Noise Pop festival is a week-long music festival held across several venues in the city of San Fransisco annually, typically in the winter. It is organized by Noise Pop, a music promoter based in SF. It focuses on indie acts but is not limited to it as it covers jazz and hip-hop as well. It began in 1993, so it has stood the test of time entering its 31st year.
Various venues in the downtown area
You can also buy tickets for individual shows rather than whole day packages.