I have partly accomplished this by editing wp-content/plugins/gigpress/admin/new.php
and replacing the following line,
<textarea name="show_notes" id="show_notes" cols="45" rows="5"><?php echo $show_notes; ?></textarea><br />
<div id="poststuff"><?php the_editor($show_notes, 'show_notes');?></div>
The now has the WYSIWYG. Found a small layout problem when I view shows, but that will be fixed soon..
I have taken your suggestion, Re: Related Post into consideration and realize that this could create double content, but I do think it's well worth it, looking at all the feature requests, by using Wordpress WYSIWYG and media-buttons, you can squash half of them (Y)