Coming soon: The beach and promenade plans provide a nice overview of the guidelines per coastal municipality.
https://www.belgiancoast.co.uk/en/inspiration/beach-promenade-and-crowds
Coming up in Wallonia in the next few days
https://walloniabelgiumtourism.co.uk/en-gb/3/see-do/this-week
Destinations Mons (see attached pdf)
https://www.visitmons.co.uk/