Rick,

It might be best to find a bar, pub, or tavern depending on what they call themselves that has a Celtic theme to it. Kilt wearers would bring them more business, and those not wearing kilts will go and tell there friends about what they saw. Make it a continual thing (same place and same weekend of the month) so that others will know when and where it is. It would help if they had a Celtic band of some sort performing that night to also bring in others, it would also show your appreciation to the band.

Maybe you would like to offer the ladies some insentive to join you and let them wear tartan and call it a Kilt and Tartan Night. If enough show up the owner may offer discounts on the drinks if you are wearing kilts or a tartan to show how much they appreciate the business.

Good luck, and don't get discouraged, it will be fun even if it is just a few, remember many great things started with just a few.