A friend just told me about the Orange International Street Fair, held every Labor Day Weekend. It's an annual event to benefit non-profit charities in the OC community. The festival includes food, beverages and entertainment from around the world, as well as arts and crafts, and a ton of live entertainment. It's situated in an area with a ton of antique shops too.
Free parking and no entrance fee for this event. Pets not allowed.
Definitely an event to remember for next year.