Theming input form for events problem.

This is just a mild annoyance, nothing too pressing.

I'm currently theming a custom input form for the event module. The start and end dates, called by:

<?php print drupal_render($form['event_start']); ?>
and
<?php print drupal_render($form['event_end']); ?>

Just look "clunky" the way they're presented by default. Where would I go to make them look really nice and neat? I tried turning on JS Calendar, and the fields just disappear in my theme, and my users aren't exactly the smartest, so I'd prefer sticking with dropdowns and text fields for dates. The page currently in question is located at:

http://demo.pittpunk.com/node/add/event