Wedding rehearsal dinner Westside
I make this recommendation often -- the Victorian House in Santa Monica on Main Street. With 120 people, you'll have the whole first floor and the patio. They do a great job decorating the place and the catering kitchen is in the house, so the food is really good. I had a dinner there for 125 people and they did a fantastic job.
Another option to consider is in Marina del Rey. Cafe del Rey would do a very nice job handling a group of this size. It would probably cost you $25,000 for that many people, but you'd get the whole restaurant to yourself and they'd do a great job on teh food and drinks. You could order off the menu or set the menu yourself.