Should we be prioritizing our schedules, or scheduling our priorities?
I don't necessarily see these two as being mutually exclusive. In fact, in my opinion, they are both important and necessary if you want to rapidly and effectively reach any goal.
Everything on your calendar should be a priority and have been prioritized prior to being put on your schedule and your schedule should take priority. You should know that it was purposely planned for maximum productivity and benefit and therefore it should be adhered to.
I hope that was helpful.