This coming Saturday the 15th, Irvine Lake is hosting the 4th Annual Music Festival from 1:00pm - 9:00pm. I attended this event last year and had a blast!
They have cover bands gracing the stage, performing music of Janis Joplin, The Who, Santana, Creedence Clearwater, The Grateful Dead, and of course Jimi Hendrix.
You can buy tickets online for $15 or or at the door for $20. They even have VIP tickets for $50 which includes appetizers, discounted drinks and reserved seating. If you don't go VIP this Saturday, you can bring in blankets, chairs, umbrellas, etc. to make your party more comfortable on the grassy knowl. They have beer tents, great food, vendors, etc. Great for kids, families, hippies of all ages.
Hopefully you have a chance to come down and enjoy the fun!