The open spaces surrounding exhibits must be tailored to permit minimum distancing. There also need to be rules governing total number of people permitted at trade fair stands. As a first step, the general rule would be to permit numbers of people that would allow 4 sqm of freely accessible stand area per person. Separate seats/seating areas (e.g. at meeting tables) are not included in the freely accessible stand area. To the number of people in the freely accessible areas the number of seats can be added. So in the first approach the total sum results in a possible number of people on the exhibition stand.
Moreover, exhibits should not be placed directly at the boundary of the stand but instead somewhat recessed to keep people from congregating in the aisles between stands.