Overiding preparation day setting.

We have a one day preparaton setting on one of our properties and I wanted to overide it just for one day to all a one off same day check out and check in in a particular week (we have a locak festival that makes bookings popular and at a premium in that week). At the moment you cannot do that without taking the preop day setting off for teh entire caolendar.

Pleas can this be considered as an upgrade?