Adds upcoming events to the venue tooltip in Event Organiser.

venue-tooltip-upcoming-events.php

<?php
/**
 * Adds upcoming events to the venue tooltip in Event Organiser. 
 *
 * Uses the eventorganiser_venue_tooltip filter to append content to the venue tooltip. This tooltip appears when
 * clicking a venue on a map (if tooltips are enabled).
 * @uses eventorganiser_venue_tooltip.
 *
 * The filter passes 2 objects: the content of the toolip, the venue (term) ID
 *
 * @requires Event Organiser 1.6+
*/

add_filter('eventorganiser_venue_tooltip','my_venue_tooltip_content',10,2);
function my_venue_tooltip_content( $description, $venue_id ){

         /* Get events that have not finished yet, at this venue */
	$events = eo_get_events(array(
		'showpastevents'=> true,
		'event_end_after'=> 'today',
		'tax_query'=>array(
          		array(
               			'taxonomy'=>'event-venue',
               			'field'=>'id',
				'terms'=>array($venue_id),
          		),
      		),
	));

        /* Append the upcoming events to the tooltip content */
	$description .= '</br></br>';
	$description .= '<strong> Upcoming Events </strong>';

	if( $events ){
		$description .= '<ul>';
                /* We have some events, so list them and their date */
		foreach( $events as $event ){
			$description .= '<li> <a href="'.get_the_permalink( $event->ID ).'">'.get_the_title($event->ID).'</a> '.eo_get_the_start('jS M',$event->ID,null,$event->occurrence_id).'</li>';		
		}
		$description .= '</ul>';
	}else{
                /* No upcoming / running events for this venue */
		$description .= 'No upcoming events';
	}
	return $description;
}