To invite a select group of people to our stand at the Woonbeurs / Meesterlijk and let them know we are around and make nice products, we made some special invitations. We used postcards of our products, made a nice package of them and pinned two dot 1.1 earrings in the last one. Some packages only had one dot 1.1. earring, so that they had to visit our stand to get the other one during the fair. After that we wrapped the package and used a fluorescent orange envelope to get noticed in their mail.
We had some very nice responses!