A more thorough explanation:

Definition: A calendar is a schedule of events or activities, often displayed in a grid format with dates and times. In a legal context, a calendar is a list of cases that a court is scheduled to hear. When used as a verb, it means to schedule a case, motion, or other activity to be heard in court.

Example 1: I checked my calendar to see when my next doctor's appointment was scheduled.

Example 2: The court calendar for next week shows that there are several criminal cases scheduled to be heard.

Example 3: The judge calendared the motion to dismiss for next month.

In Example 1, the word "calendar" refers to a personal schedule or planner. In Example 2, the word "calendar" refers to a list of cases that a court is scheduled to hear. In Example 3, the word "calendared" is used as a verb to mean scheduling a motion to be heard in court.