I’m building a class calendar using the Monthly Planner template.  I’m wondering if there’s a way using JavaScript, Python, or simply a unknown-to-me feature that lets me easily start a calendar on a date and have it fill in the rest of the date labels on the calendar.  Seems like this should be a built-in, commonly used feature, but apparently not.

Or, alternatively, is there a better calendar template?  I do semester-long calendars that map out an entire course with milestones, holidays, lectures and assignments.  There seems to be two versions of the Monthly Planner template.  When you create it in the browser app, it’s a weekly planner with generic labels.  If you create one using the desktop app, it’s more like a familiar calendar grid, but without dates.