The Sky River Rock Festival and Lighter Than Air Fair was a historic rock festival held on a raspberry farm on the Skykomish River outside Sultan, Washington. First held August 31 to September 2, 1968, it was the first multi-day outdoor hippie rock festival at an undeveloped site. The line-up included bands such as the Grateful Dead and Santana.
In 1968, the town of Sultan, Washington was visited by more than thousands of hippies during the festival. Though the event was ticketed, many thousands of people showed up without tickets and snuck in. The festival was a benefit for Mexican American Federation of Washington, the Foundation for American Indian Rights and the Central Area Peace and Improvement Cooperative. The Camlin Hotel hosted performers for the festival.