CALENDAR_EMPTY_DAYS — At the beginning and end of the month, there may be blank squares on the calendar. For instance, if the 1st of the month lands on a Wednesday, the Sunday-Tuesdays squares are non-existent. In the construction of a pretty HTML table, it will be necessary to make a TD cell with a COLSPAN equal to the number of empty days. If you are not making your calendar view look like a calendar, just leave this variable blank. Note: this variable is used in the %%emptydays_beg%% and %%emptydays_end%% properties of the CALENDAR_WEEK variable.