This can be discussed with the corresponding IUCr commission. The person responsible for coordination of these events is the chair of National Advisory Board (AB) - Jindrich Hasek (hasekjh et seznam.cz).
Questions, comments etc. can be sent to Martin Haloun (PCO Auletris) - exhibition et iucr2020.org. Booklet for sponsor and exhibitors is in preparation.
Any of the above suggestions or comments can also be sent to the congress chair
Radek Kuzel (kuzel et karlov.mff.cuni.cz).
General conference e-mail: info et iucr2020.org