Stop change requests been sheduled for certain dates

Stop change requests been sheduled for certain dates

We have certain dates when we do not allow change requests to be scheduled such as over the Christmas period currently, these enforcements are manual it would be great if we could somehow add these dates to the service desk scheduler and not allow planned Change requests to be scheduled for these dates.
 
We also have some other rules such as a change request cannot be performed the day before the technician goes on holiday, we already  add technicians holidays to the scheduler.
 
The final rule we have is no change requests on a Friday as we have staff working at the weekends but no core IT support except an out of hours service.
 
Thanks
Phil

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