Laws pretaining to wine tastings

[Stellarheat]

I am a member of a small business association in a small town in Wisconsin. Our association members would like to have a wine-tasting event. We would have people come into each of our stores for a taste of a wine. I haven't been able to determine if a liquor license is required in order to serve the wine in our stores.....does anyone out there have experience with wine tastings of a similar sort? Do you think it would be necessary to have a license?