That festival is on my list, not made it up there yet.
I've attended several craft beer festivals in California and Nevada, and recently attended one in West Virginia.
I've never worn kilts to one. If I were a Scotsman at a Scottish booth, like the OP, of course I'd be kilted. But I'm just an American attendee.
Proud Mountaineer from the Highlands of West Virginia; son of the Revolution and Civil War; first Europeans on the Guyandotte