I wish you a great day as well and thank you for the extra details.
Currently, this is how the grouping works, it shows all groups and subgroups even if there is no event. This is because usually the resource is not restricted to a specific meeting room. For example, Alex may have a meeting in room 1 at 10: 00 AM and then another meeting in room 2 at 02: 00 PM. This is why we present the groups the way we are.
In this case, we can remove the grouping by persons and only leave the person as resources. With this, the rooms will be the grouping criteria and there will be still information for the persons who will attend the event:
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