Great plugin. I ran into a minor issue where the dollar sign was messing up the feed. It, and any characters right after it, would disappear.
E.g.: Instead of "$75 fee applies", I'd see " fee applies".
I needed a quick fix - adding the following str_replace @ line 38 in import_ical.php seemed to do the trick.
$data = str_replace( "$", "$#36;", $data );
Thought I'd note this - hope it helps someone else.