The Acid Tests Testing were a series of parties Social_event held Hold by author Ken Kesey primarily in the San Francisco Bay Area during the mid-1960s , centered entirely on the use Using of , and advocacy of , the psychedelic drug LSD , also known as `` acid '' .

The festival is mainly known for psychedelic trance , minimal techno , and chill-out music on its main stage , but it features other genres of electronic music and non-electronic music on the smaller stages .