Single Day Template Change

Most months, we have one early release day. All subjects are compacted and all non academic times change: lunch, recess, dismissal. I'm going in to change to the early release template (all on one card) each month and trash all of the non academic times, which I have on blank cards. After the early release, I must go into the next week and turn off the early release template and re-engage all of the daily templates and reset all of the non academic cards. I would like to be able to use a drop down menu, or other simple device, to set up single day template changes both at the time of a schedule change and at the beginning of the year so that some days are set as early release days ahead of time.