You need to trust your calendar as sacred territory, reflecting the exact hard edges of your day’s commitments, which should be noticeable at a glance while you’re on the run. That’ll be much easier if the only things in there are those that you absolutely have to get done, or know about, on that day.
This is key. Placing items from todo lists don't make sense because that will typically be the due date, not the day you need to pick them up.
