Adds the venue's name to the content appearing in the tooltip when hovering over an event in fullcalendar

venue-name-in-event-tooltip.php

<?php
/**
 * Requires Event Organiser 1.6+
 *
 * Adds the venue's name to the content appearing in the tooltip when hovering over an event in fullcalendar
 * @uses eventorganiser_event_tooltip filter.
 *
 * The filter passes 4 objects: the content of the toolip, the post ID of the event, the occurrence ID 
 * of the event and the post object (the last one probably won't often bed needed).
 * In this example we just need the first two.
*/
add_filter('eventorganiser_event_tooltip', 'my_event_tooltip_content', 10,2);
function my_event_tooltip_content( $description, $post_id ){

	$venue_id = eo_get_venue($post_id);

	if(  $venue_id ){
                //Event has a venue, append this to the event description.
		$description = 'This event is at '.eo_get_venue_name($venue_id).'</br></br>'.$description;

	}

	return $description;
}
?>