Context would be useful methinks: it was at an Irish festival, and they were performing the songs with a Celtic twist, so fiddling, bagpipes, and banjos were involved.
Bagpipes are Scottish...... Though I guess if there's evidence that the Celts invented it or the Irish also used it, whatever.
And banjos are, um.... American? Meh, I'm just tired and nitpicking it......
Technically bagpipes aren't Scottish, just heavily associated with 'em.
I am also confused as to why there were banjos, but they were played by Irish folk.
I also s'pose the festival could be considered Celtic, it's just called Irishfest, so I feel obliged to say Irish festival

last year there was a group called Celtic fiddle festival that involved playing music from Burgundy, which is apparently considered Celtic too. Never knew that, but that was awesome music anyway.
Edit: maybe it was Brittany... northwestern France anyway, I'm also tired so probably recalling things poorly.