Admit four to the Marin County Fair.  This year will mark the 64th anniversary of the Marin County Fair and a renewed sustainability theme: Cool Green Fun. The summer's biggest community celebration will showcase the many wonderful ways Marin's fair is leading the way in green and environmental efforts and offering five days of family fun! From bigger-than-ever fireworks displays to big-name musical entertainment, the 64th edition of the fair will be a spectacular five-day party, scheduled to run July 1 - July 5.