Our guild has used several methods to encourage members to wear nametags. One is to pay the "Piggie". We have a large pink piggie bank and if you don't have a nametag on, you have to pay 25 cents to the pig. The other method we used was to have a nametag making contest and we awarded a $25.00 Gift Certificate to the winner (chosen by secret ballots) to our local quilt shop. Both of these worked well.