just got back from celtic weekend in Abingdon VA., saw several bands:

Rathkeltair...always awesome, Bordercollies and somebody new to me,a band called Tempest. Their music was great and they put on a fantastic show.
These guys are from california and unfortunately i dont think they make it farther south than virginia. They are touring up north. If you can make it to their show you should check them out.

on a side note check out rathkeltair.com for a link to the "Clan na Gael" (original 7N lineup) concert dates NY and PA are already on sale. sweeeeet.