In the Valley, you could basically take over Alcazar in Encino. You could have an assortment of different hot and cold mezza for the guests for a very reasonable price.
You didn't mention the price, so I apologize if this is outside your price range. For $45-$60 pp, Il Moro has a very nice patio that could be used for a rehearsal dinner.
Il Moro Restaurant
11400 W. Olympic Blvd., Los Angeles, CA 90064