I'm an LA mom on a one-night mission to San Fran. I have the opportunity to host an east coast college's "a capella" group (my west coast son included) for their Friday night post-singing dinner. But where? Is there a spot in Chinatown or Little Italy that will provide local color plus good food? A burger joint that can handle a dozen or so of us? Undoubtedly, the guys will need to ditch me for their own carousing once dinner is done. All suggestions welcome. It will also be my birthday and so I'm hoping for a memorable night, whether it be the food or the setting or the company that makes the occasion.