DS1 got hf&m in his first week of daycare, even though no one else in the centre supposedly had it! Fortunately he had a really mild case, just a few spots/teeny blisters on his fingertips and feet. No puss at all. So there wasn't much we needed to do except keep him out of contact with other kids. In our case, the disease sounded far worse than the actual symptoms.
I was very newly pregnant when DS1 had it - prob around 3-4 weeks from memory - and there was no drama with me or bubba #2. I'd think that all you can do is keep up your good hygiene habits. If your DS has it too, hopefully it's a mild case. But unfortunately it does sound like you'll have to give your xmas show a miss - sorry hun.