This was new; this pain wasn't part of the soreness I'd had all week.
The next practice I can go to is an open skate at the roller rink in Lebanon, on Saturday. I'm going. Fortunately, I've been told it has a wonderfully grippy floor, much better for skating than the floors at the fairgrounds. Between now and then, I am going to try to stretch my legs every day and hope this muscle spasm, or whatever it is, goes away.