For me, a kilt night is any night I wear a kilt...

I've seen one other kilt in my area, but it was on a student where I work, and any sort of friendship/hanging out/fraternization between employees and studentsis strongly discouraged...

My wife has seen 2 men in kilts where she works...
There's a pipe band that is based about an hour from me, but as far as I know, now of them wear their kilts unless they are piping...

I have yet to encounter anyone else kilted near me. I've considered loaning one of my cheap kilts to a friend just so I won't be alone.