Mumsnet: How can I ask people not to wear heels tonight without sounding like a tw*t
There are a lot of militant shoes-on people on Musmnet, but thankfully plenty of users there support shoes-off.
This blog recommends that you adopt a shoes-off policy in your home, not just for family but also for guests and other visitors. Socks, slippers and bare feet are fine indoors, but not shoes. Just say NO to shoes in your house!