There is a super awesome company that does the most amazing magical kids birthday parties. They specialize in faeries but they do some other characters too. All the costumes are handmade and the performers are incredible. Check them out at happilyeverlaughterparties.com. Rates vary based on package selected.
Their East Bay performers cover Berkeley, Oakland, Alameda, Piedmont, Orinda, Lafayette, Walnut Creek, Danville, Pleasant Hill, Concord, Richmond and Vallejo.