SarahD8, plenty of people with no Irish background do Irish dance these days. Once the Riverdance show made it popular, it got more mainstream. The kids in our dance school are all ethnicities, unsurprising since I'm in a big city. Give it a try! The other thing you could check out is Irish social/folk dance, which happens at some Irish pubs. It's a lot of fun.
Jenni, yes, I'm something over 3/4 Irish, and on my mother's side particularly, I still know lots of cousins in Ireland. But I'm one generation too removed for citizenship - my great-grandmother was born there and came here around 1900. She lived to 104 so I did get to know her at least!
Efbgen, I don't know how the feis moms do it. Part of me wishes I'd done this as a kid - I started when I was 29. I know my mother would have hated the travel and expense and makeup and all. Still, it's really hard to get my feet fast enough as an adult learning it for the first time, vs the people who learned as kids and come back later. The speed comes back quickly for them. I'm in prizewinner - adult levels stop there - and I do quite well but I always lose to the one woman who was in open champion as a kid and came back years later.
Such a shame about your daughter's knee. That's painful. Does she compete in the adult category now or with the "& over" age group? I would love to switch away from adult but I don't know that I'd keep up very well. The one nice thing about the wigs though - I bet if I put on a curly wig and did good makeup, no one would realize I'm 20+ years older than them!