San Francisco's longest-running free concert series is back as Stern Grove Festival celebrates its 76th year with a two-month series of live music events featuring big names like Kronos Quartet, Geographer, Deltron 3030, Michael McDonald, Shuggie Otis and more.

San Francisco was out in full force this past weekend for a flurry of concerts, parties and huge events. From the Killers' two-night stint at Bill Graham to Electric Run's glowing 5k festivities, we've rounded up a few of our favorite photos from the weekend. Check out our top pics and relive all the action.

San Francisco commemorated the 70th anniversary of Dr. Hofmann's legendary bicycle "trip" with a colorful bash at 1015 Folsom featuring live painting from Alex Grey and DJ sets from Shpongle, Bluetech, Random Rab and more. Catch a glimpse of the magical night of sights & sounds and relive the tradition in our Bicycle Day photo gallery.

High Sierra Music Festival has been lighting up the mountains and hills of northern California for over twenty years. Located about 80 miles north of Reno, NV, the mid-sized fest highlights an eclectic array of musical offerings focused on jazz, newgrass, bluegrass and jam bands but also featuring funk, electronica and world music. Check out the 2013 lineup and mark your calendars for a trip to Quincy this July.