How can you tell when Riverdance has gone into a second or third or fourth turn? Do you just sentence the kids to X number of hours? Some one had better take you seriously, so for what it's worth, here's what I suggest.
The Daltaí website lists only one Irish language teaching contact in Michigan (the language is our focus here), namely:
Comhaltas Ceoltóirí Éireann Comments: Non-credit course.
14830 Cherry Lane
Plymouth MI 48170
Phone: (734) 420-0962 Email: firstname.lastname@example.org
Comments: Non-credit course.
That doesn't look too promising. Most classes are for adults -- there are very few good programs to foster Irish awareness in kids.
Fortunately, this contact is connected with Comhaltas Ceoltóirí. Their focus is the music and members tend to be scattered everywhere. He should be able to clue you into Irish cultural activities like language and music classes, dance classes, concerts, feiseanna (festivals) and dances.
Since programs for kids are thin on the ground, what you really have to do is get into the culture yourself and make it a family thing. Probably the activities will be all the more plausible to the children if you are the leader.
For example, my father didn't send us to classes to learn Irish -- HE went to classes, then taught US what he learned. In Ireland, parents often regard it as only the school's responsibility. Kids then get the message that the parents don't value it.
Take an integrated approach: read them children's books, learn some Irish together with tapes and books, go to musical events and get them a couple of videotapes besides Riverdance. Maybe other people here can recommend books, tapes, etc. for children. The Dover Celtic tattoo book has Irish designs and costs a dollar (the tattoos are gone in a week). (It's also my observation that it is good to involve Germans. If they have any real German in them, they can become quite enthusiastic and determined.)