html tags and python

[Kane]

If I understand what you are asking then Python & CGI are a poor
solution.  It would be easy to have one page ask for the month, click
submit, then have a second page ask for the exact date.  Easy; but
terrible design.

You want to have one page with a dropdown of months.  When you select a
month, you want to dynamicly alter a dropdown of dates without
refreshing the page.

For this task you'll want to pull JavaScript out of your toolbox.  This
is a fairly common "problem" and googling for examples/samples should
be quick-n-easy.