Modification for the Diarise theme (WooThemes). Adds Event Espresso 4 events to the home page calendar.

events-calendar.php

<?php

// First part of the modification happens in the first loop
// The first loop starts after the comment that says:
//Improved Diarise get events query

// Before the query, you add a post_type query argument:

$query_args['post_type'] = array('post', 'espresso_events');

// Now here's the original loop #1:

			if ($the_query->have_posts()) : $count = 0;

			while ($the_query->have_posts()) : $the_query->the_post();
				//add post to array
				global $post;
				$event_start_date = get_post_meta($post->ID,'event_start_date',true);
				$event_end_date = get_post_meta($post->ID,'event_end_date',true);
				if ($event_end_date == '') { $event_end_date = $event_start_date; }

				if ( ( $event_start_date != '' ) && ( $event_end_date != '' ) ) {

					$time_start = strtotime($event_start_date);
					$time_end = strtotime($event_end_date);
					$start_range = strtotime($woo_start_calendar_range);
					$end_range = strtotime($woo_end_calendar_range);

					if ( ( ( $time_start <= $start_range ) && ( $time_end >= $start_range ) ) || ( ( $time_start >= $start_range ) && ( $time_end <= $end_range ) ) || ( ( $time_start <= $end_range ) && ( $time_end >= $end_range ) ) ) {
						$search_results[$post->ID] = array( 'ID' => $post->ID , 'start' =>  $time_start , 'end' => $time_end );
					}
				}
				
			endwhile; else:
    			//no posts	    	
    		endif;
    		
// Here's the modified loop #1 that adds the Event Espresso events:

			if ($the_query->have_posts()) : $count = 0;

			while ($the_query->have_posts()) : $the_query->the_post();
				//add post to array
				global $post;
				// Add Event Espresso events
				if (get_post_type() == 'espresso_events' ){
					EE_Registry::instance()->load_helper( 'Event_View' );
					$event = EEH_Event_View::get_event( get_the_ID() );
					if ( $event instanceof EE_Event ) {
						$event_start_date = espresso_event_date('m/d/Y', '', get_the_ID(), false);
						$event_end_date = espresso_event_end_date('m/d/Y', '', get_the_ID(), false);
						$event_start_date = date('m/d/Y', strtotime($event_start_date));
						$event_end_date = date('m/d/Y', strtotime($event_end_date));
					} 
				} else {
					$event_start_date = get_post_meta($post->ID,'event_start_date',true);
					$event_end_date = get_post_meta($post->ID,'event_end_date',true);
				}
				// End adding Event Espresso events
				if ($event_end_date == '') { $event_end_date = $event_start_date; }

				if ( ( $event_start_date != '' ) && ( $event_end_date != '' ) ) {

					$time_start = strtotime($event_start_date);
					$time_end = strtotime($event_end_date);
					$start_range = strtotime($woo_start_calendar_range);
					$end_range = strtotime($woo_end_calendar_range);

					if ( ( ( $time_start <= $start_range ) && ( $time_end >= $start_range ) ) || ( ( $time_start >= $start_range ) && ( $time_end <= $end_range ) ) || ( ( $time_start <= $end_range ) && ( $time_end >= $end_range ) ) ) {
						$search_results[$post->ID] = array( 'ID' => $post->ID , 'start' =>  $time_start , 'end' => $time_end );
					}
				}
				
			endwhile; else:
    			//no posts	    	
    		endif;
    		
// Later down the file, there's a second loop that actually displays the events on the calendar
// Here's the start of the original loop #2

			foreach ($event_results as $event_result) {
			
			$query_args['post__in'] = array($event_result);
			?>
			<?php query_posts($query_args); ?>
          <?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
          <?php 
          //Post Meta
          $event_start_date = get_post_meta($post->ID,'event_start_date',true);
          $event_end_date = get_post_meta($post->ID,'event_end_date',true);
          $event_start_time = get_post_meta($post->ID,'event_start_time',true);
          $event_end_time = get_post_meta($post->ID,'event_end_time',true);
          $event_location = get_post_meta($post->ID,'event_location',true);
          $maps_active = get_post_meta($post->ID,'woo_maps_enable',true);

// Here's the modified loop #2 that adds Event Espresso events:

			foreach ($event_results as $event_result) {
			
			$query_args['post__in'] = array($event_result);
			?>
			<?php query_posts($query_args); ?>
        <?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
        <?php 
        //Post Meta
			if (get_post_type() == 'espresso_events' ){
			EE_Registry::instance()->load_helper( 'Event_View' );
			$event = EEH_Event_View::get_event( get_the_ID() );
				if ( $event instanceof EE_Event ) {
					$event_start_date = espresso_event_date('m/d/Y', '', get_the_ID(), false);
					$event_end_date = espresso_event_end_date('m/d/Y', '', get_the_ID(), false);
					$event_start_date = date('m/d/Y', strtotime($event_start_date));
					$event_end_date = date('m/d/Y', strtotime($event_end_date));
					$event_start_time = date('g:i', strtotime($event_start_date));
					$event_end_time = date('g:i', strtotime($event_end_date));
					$event_location = EEH_Venue_View::venue_name();
				} 
		} else {
      $event_start_date = get_post_meta($post->ID,'event_start_date',true);
      $event_end_date = get_post_meta($post->ID,'event_end_date',true);
      $event_start_time = get_post_meta($post->ID,'event_start_time',true);
      $event_end_time = get_post_meta($post->ID,'event_end_time',true);
      $event_location = get_post_meta($post->ID,'event_location',true);
    }
      $maps_active = get_post_meta($post->ID,'woo_maps_enable',true);