The general hygiene requirements apply here (distancing rules, medical mouth nose protection). Visitors and stand staff must also have an opportunity to disinfect their hands (e.g. disinfectant dispenser).
We also recommend that you clean surfaces that can be wiped down are subject to particularly high-frequency contact (e.g. meeting tables, tables where food/drinks are dispensed and consumed) with high frequency (e.g. after each use). Surfaces with lower frequency of contact and that can be wiped down can be cleaned less often (e.g. cleaning every one to two hours). Personal hygiene plays an important role in this regard (with disinfectant provided at the trade fair stand for visitors and stand staff).