I wrote a plug-in to add several features to advanced-events-registration, but one change was easier to do by directly editing get_event_details.php.
I was wondering if you would update this file using the code below to add semantic mark-up that we can use for CSS.
Here is the code with modifications starting at line 38.
<div id="event-<?php echo $event_id?>">
<h3 class="event_title"><a href="<?php echo get_option('siteurl')?>/?page_id=<?php echo $event_page_id?>®event_action=register&event_id=<?php echo $event_id?>&name_of_event=<?php echo stripslashes($event_name)?>">
<?php echo stripslashes($event_name)?>
</a></h3>
<div class="event_details event_date">
Date:
<?php echo event_date_display($start_date)?>
</div>
<div class="event_details event_cost">
<?php if ($event_cost == '' || $event_cost == ' '){ ?>
Free Event
<?php }else{?>
Cost: <?php echo $org_options['currency_symbol']?><?php echo $event_cost?>
<?php }?>
</div>
<div class="event_details event_spaces">
Spaces Available:
<?php echo $available_spaces?>
</div>
<div class="event_register_link">
<a href="<?php echo get_option('siteurl')?>/?page_id=<?php echo $event_page_id?>®event_action=register&event_id=<?php echo $event_id?>&name_of_event=<?php echo stripslashes($event_name)?>">Register Online</a>
</div>
</div><!-- end event-id -->
http://wordpress.org/extend/plugins/advanced-events-registration/