First of all, thanks for making this plugin. Saved me some time with the importing of the RSS feed.
My friend does all our css development, and he noticed that you're wrapping each date from the feed with a <div id="slushman_adp_shows" id="slushman_adp_<?php echo $show->recordKey; ?>">
According to him, div id's should only be used once, so in our local instance of your code, I changed it to:
<div class="slushman_adp_shows" id="slushman_adp_<?php echo $show->recordKey; ?>">
You may want to use that anywhere you're using id's. Just changing that one works for our purpose. You can see it in action here: http://www.jillionairesucks.com/gigs