Can I recommend no beter organisation than 'Dvorana' to introduce you to Czech/Slovakian folk music/dancing which includes Moravian.

I have had the good fortune to experince 2 very enjoyable holidays with them, you can do no better than going to the source! This is an example from their programme this year:

http://dvorana.cz/dance/2008/folk/index.php?page=folk&sub=program1