My son (a freshman in high school) has been invited to the El Cerrito High senior prom. It will be held at the Argent Hotel in SF this Saturday. He and his date and another couple are looking for a place to have dinner in the city beforehand - prom starts at 7 so it will be an early dinner. Any suggestions for a place that will be nice (since they will be in gowns and tuxes) but not break Mom's wallet? Thanks for any ideas.