Maybe this isn't a job for Excel - if you know of a program that's
built for this, I'd appreciate the tip!

In XL2000, I'd like to make a table of items:
Col A = Description
Col B = Date Due
Col C = Date Completed

In Cols F-L, I'll create a calendar, giving each day four or five
rows. The first row of each set would have the date.

A formula in the rows under the date would find all matching dates in
Col B and return the description from Col A. That sounds like
VLOOKUP, yes?

The table will not be in any kind of order, and will vary in length
from month to month.
Dates will appear more than once, possibly but not necessarily
consecutive.
Won't VLOOKUP just return the first value it comes to and ignore
multiple entries?

Ed