Opening the crazy-fun Marin County Fair is the just-plain-crazy “Weird” Al Yankovic (July 3), paving the way for Disney Channel stars, reggae legends and mariachi bands to play free-with-admission concerts on the fairgrounds’ island stage. Independence Day brings the Kingston Trio and Eddie Money (July 4), followed by Zendaya and Ozomatli (July 5), the Nitty Gritty Dirt Band and the Wailers (July 6), Mariachi Sol de Mexico de José Hernandez and the Pointer Sisters (July 7). There are free fireworks every night, and all rides are free with admission! Celebrate summer July 3—7 at the Marin Fairgrounds, 10 Avenue of the Flags, San Rafael. $14—$16. 415.473.6800.