Get 'todays' event with Event Organiser. (Today means running today - might have started before today).

get-todays-event.php

<?php
/**
 * Returns today's event (or false if it one doesn't exist). If there is more than one it simply returns the first one.
 * By 'today' I mean running today (though could have started earlier). You can change altering it slightly.
 *
 * @see http://wp-event-organiser.com/documentation/function/eo_get_events/
 *
*/
function sh_get_todays_event(){

     //Get events running today
     $events = eo_get_events( array(
          'event_start_before' => 'today',
          'event_end_after' => 'today',
          'numberposts' => 1,
     ));

     if( !$events ){
       //If no events, just return false
       return;
     }else{
       return array_pop( $events);
     }
}


/* 
 * Usage:
 *
 * global $post; //This stuff is needed for the title/content!
 *
 * if( $post = sh_get_todays_event() ){
 *
 *    setup_postdata(); //Needed for the content!
 *
 *    echo '<h3>'.get_the_title().'</h3>';
 *
 *    the_content();
 *
 *    //Clean up after ourselves
 *    wp_reset_postdata();
 */