Blocking the addition of events by date.

Are you aware of the booking-facility in LuxCal.
It is possible to block other events for a category (or for all categories) by specifying this for a category.
Then - when an event is made that has that category it will not be possible to have other events in the period for an event with same category (or all). If "same category" is checked then no other events with that category can take place in the event period.
If "all categories" is checked, then no other events can take place in the event-period - whatever the category.

Is this kind of what you ask for?

I am having trouble with the system - even if I use no links the system think I do.
I will try to split up in more posts

Monday        from xx-xx to xx-xx in the period  from yyyy-xx-xx to yyyy-xx-xx
Tuesday       from xx-xx to xx-xx in the period  from yyyy-xx-xx to yyyy-xx-xx
wednesday  from xx-xx to xx-xx in the period  from yyyy-xx-xx to yyyy-xx-xx
Thursday     from xx-xx to xx-xx in the period  from yyyy-xx-xx to yyyy-xx-xx
Friday         from xx-xx to xx-xx in the period  from yyyy-xx-xx to yyyy-xx-xx
Saturday     from xx-xx to xx-xx in the period  from yyyy-xx-xx to yyyy-xx-xx
Sunday       from xx-xx to xx-xx in the period  from yyyy-xx-xx to yyyy-xx-xx

And then users in that group are only allowed to register events that lies within these specifications?
This could make multi-day events impossible to register.

I think it would be a rather specific feature. What could it be used for?

I think we are maybe back to one of the things the booking-feature was made for.

I will describe some scenarios:

Scenario 01
You have a category for each of the activities: Tennis and football.
For the tennis category you have set that booking the court is with fixed time (ie. 2 hours) and a gap is set to be 15 minutes (to prepare the court for new players).

When players makes an event (booking) for the tennis-court, they set the players in the notification-field so they can be notified x days before the match. When the event is made, no-one else can book the tennis-court in the specified time.

This is the booking for the court. Then you have a tennis coach. He checks via a list where he selects the category=tennis. He now sees that from xx to yy there must not be made more bookings as he will have used his amount of time.
He then makes an event(booking) that spans from xx to yy. He uses the tennis-category for the event, which means that the footballers are still free to book the footbal lane.
No tennis persons can then no more make bookings before the time yy is reached.

Scenario 02
Same as scenario 01, but there is only one coach so the coach has to block all activities in the period xx to yy.
He (the coach) then simply makes an event where he uses a category that blocks all other categories.

If you have more tennis lanes, then you make a category for each lane.

If you use the coach to be the eventowner where the users when an event is made, has to transfer ownership, then the category is the one ressource in a matrix and the eventowner is the other ressource in the matrix.
The "players" is specified in the notification field - either as names or numbers specified separated by semicolons or as participants/players that is registered in a list and then the list is registered in the notification field.
When a normal user has transferred ownership, then only the new owner (depends on the settings you make) can edit the event. The coaches could be managers in the calendar.

You can have a display that is set up to show all events for a user (coach) - this will make it possible to have the dosplay on his mobile and then he can always see the coming "matches" he is responsible for as coach.

There could also be displays for the tennis-lanes so all users can see when the lanes is booked. The displays is very handy for mobiles.

If CRONJOB is active then the players will automatically be notified by mail, SMS and/or Telegram.

It is possible for a coach to select on a list all "his" matches. The only thing I can think of that is not possible is that the coach could select a list of "his" matches and then the list accumulated and showed the total time/duration of all the events on the list.