Rehearsal Dinner Westside or Valley
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