get_template_part() - post-meta not working?

Try globalizing $post inside of event-item.php.

Also: be sure to call wp_reset_postdata() after you close your $loop while loop.

e.g.:

<!-- event-item.php -->
<?php 
// globalize $post
global $post; 
?>
<div id="event-<?php the_ID(); ?>" <?php post_class(); ?>>

    <div class="event-date"><?php echo $event_date; ?></div>
    <div class="event_time"><?php echo $event_time; ?></div>
    <div class="event-speaker"><?php echo $event_speaker; ?></div>
    <div class="event-title"><a href="https://wordpress.stackexchange.com/questions/49285/<?php the_permalink(); ?>"><?php the_title(); ?></a></div>
    <div class="event-description-excerpt"><?php the_excerpt(); ?></div>

</div>
<!-- event-item.php -->

and then:

<?php 
endwhile; 

// Restore $post global to the primary query
wp_reset_postdata();
?>

Edit

Assuming the problem is just the post meta data, I would suggest moving the post meta data variables inside loop-item.php. Only a guess, but perhaps your local variables aren’t getting passed through the include() function that is part of get_template_part().

So, like this:

<!-- event-item.php -->
<?php
// Define these here, inside loop-item.php
$wr_event_fields = get_post_custom();
$event_date_timestamp = $wr_event_fields['_wr_event_date'][0];
$event_date = strftime('%d.%m.%Y', $event_date_timestamp);
$event_time = $wr_event_fields['_wr_event_time'][0];
$event_speaker = $wr_event_fields['_wr_event_speaker'][0]; 
?> 
<div id="event-<?php the_ID(); ?>" <?php post_class(); ?>>

    <div class="event-date"><?php echo $event_date; ?></div>
    <div class="event_time"><?php echo $event_time; ?></div>
    <div class="event-speaker"><?php echo $event_speaker; ?></div>
    <div class="event-title"><a href="https://wordpress.stackexchange.com/questions/49285/<?php the_permalink(); ?>"><?php the_title(); ?></a></div>
    <div class="event-description-excerpt"><?php the_excerpt(); ?></div>

</div>
<!-- event-item.php -->

Also, to avoid undefined variable notices, you should define your variables using isset() conditionals; e.g. change this:

$event_date_timestamp = $wr_event_fields['_wr_event_date'][0];

…to this:

$event_date_timestamp = ( isset( $wr_event_fields['_wr_event_date'][0] ) ? $wr_event_fields['_wr_event_date'][0] : false );

Edit

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