Re: Identify during which week within a date range the most course meetings occur
I suspect you don't have PowerPivot, a new feature for 2010/2013.
See this book:
"Microsoft Excel 2013, Building Data Models with PowerPivot"
by Alberto Ferrari and Marco Russo
or other "PowerPivot" books.
Without the PowerPivot Add-In, you can still derive your desired data from sheet "Calendar"