 The Articles of Incorporation further state that the organization is formed to promote, encourage, foster, and cultivate the preservation, appreciation, understanding, enjoyment, support, and performance of traditional instrumental and vocal music of the United States.The California Bluegrass Association has sponsored dozens of bluegrass festivals since its inception.The organization's main festival, held every Father's Day Weekend in June, is a four-day event at the Nevada County Fairgrounds in Grass Valley, California.