Sorry, I don't know what region the family is from. Here in Silicon Valley we often say our neighborhood is like a mini-United Nations. I know many of our neighbors from Asian countries don't wear shoes in their homes. When we were in London a few years ago we visited an English family who removed their shoes indoors. I have so many foot problems that it is painful for me to go barefoot. I apologized to the hostess, but this was at the end of our trip and after walking over cobblestones and rough streets for two weeks, I couldn't bear to take off my sneakers. And my podiatrist told me never to go barefoot.
We are going to a concert and dinner in SF at a private home tomorrow and I'm trying to figure out what to wear. It occurred to me that protocol would require me to take off shoes--my DH has similar problems. I can stand to walk on thick carpeting a few steps, but hard floors are painful. I have some ugly Hilton slippers (DH brings them home from business trips) but they don't help much.
It may be I'm worried for no reason--this is California not London. Still, maybe not. What do my wise cosmopolitan Fabber's say? I'm kind of embarrassed to even have to ask so late, especially since I don't even know what the proper dress will be. It is Silicon Valley after all.