Figured I'd refresh this and relate a few things I've learned in the meantime.

This is a pretty big-deal festival in this part of the Celtic-music world, and features lots of acts ~ a half-dozen or more stages, going on all at the same time, all day for two days.

With the exception of two or three "headliners," nobody gets paid (i.e., none of the "regional" acts providing the bulk of the entertainment). It's OK, though: as a performer, you don't draw any pay from the management, but then again you but you don't have to pay them for anything. Not is your admission gratis (as should be expected, of course), but also all the food you can eat and an unlimited supply of Guinness.

I can live with that!