Exhibitors of trade fairs in Germany are contacted by providers of exhibitor directories - such as “Expo-Guide” or "International Fairs Directory" - asking to update the catalogue entry for the various trade fair participation. Only in fine-print it is mentioned that this is not the catalogue of the organizer. By your signature, you agree with a minimum duration for this entry about three years and have to pay more than 1,000 Euro every year.
As organizer of demopark, we would like to point out explicitly that this is not the official exhibition catalogue. We do not know the “Expo-Guide” rather "International Fairs Directory" neither its location nor distribution.