Last year, the 20th Street Block Party served up a free afternoon of excellent music and cool neighborhood vendors. This year, the block party returns for another free day of fun on August 23rd. The band lineup is great, with performers including Rogue Wave, Cayucas, Melted Toys, Ray Barbee and The Mattson 2 featuring Tommy Guerrero, The Bilinda Butchers, Myron & E, 8th Grader, 1955, and San Francisco Rock Project. As was the case last year, the music will be accompanied by a wide variety of food vendors and activities. Find out all about this year's block party here.