In my opinion a "festival" suggests an event that is circus-like and a Celtic Festival would celebrate all things Celtic, historical and present. That being said, wear what you want as you will see all things there. Something else to keep in mind, many don't have silver in pocket to drop on the total package, jacket, shoes, kilt, sporran, belt, etc, it can run ito several grand easy. Many are works in progress and they may be there wearing kilt with a tee or polo shirt. Others that are performing may not want to spend a weekend, especially in warmer climates, wearing their jacket and polished brogues and will revert to the comfort of more contemporary dress.

One thing I found that was totally non-traditional was the fried Oreos at the Stone Mountain Games here in Georgia. Oreo rolled in sweet dough, fried and sprinkled in powders sugar......I drool as I type!