I prefer to use large planners instead of small pocket calendars. This gives me plenty of space to not only note appointments, but it's also helpful when I need to record something a foster child or birth parent has said to me or to document a behavior issue at school.
Use this printable calendar to help track behaviors as well as appointments, phone calls, and mileage to appointments and visits.
After printing the calendar fold in half (the x's mark the fold line). Then punch holes along one side (the x's on the outside edge) and place in a small day planner or binder.