P2p function

<?php
p2p_register_connection_type( array(
    'name' => 'posts_to_invitations',
    'from' => 'post',
    'to' => 'invitations',
    'sortable' => 'any',
    'admin_dropdown' => 'from',
    'admin_column' => 'from',
    'fields' => array(
        'couples' => array(
            'title' => 'Couples',
            'type' => 'checkbox'
        ),
        'going' => array(
            'title' => '# Going',
            'type' => 'select',
            'values' => array( 'No Response','Not Going', '1', '2', '3', '4', '5', '6', '7', '8' )
        ),

        'attend' => array(
            'title' => '# Attend',
            'type' => 'select',
            'values' => array( 'Not Attending', '1', '2', '3', '4', '5', '6', '7', '8' )

        ),
        'comments' => array(
            'title' => 'Comments',
            'type' => 'text',
        ),
        'table' => array(
            'title' => '# Table',
            'type' => 'select',
            'values' => array('01', '02', '03', '04', '05', '06', '07', '08', '09', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', '20', '21', '22', '23', '24', '25', '26', '27', '28', '29', '30', '31', '32', '33', '34', '35', '36', '37', '38', '39', '40', '41', '42', '43', '44', '45', '46', '47', '48', '49', '50'  )

        ),
    )
) );

// Find connected pages
$connected = new WP_Query( array(
  'connected_type' => 'posts_to_invitations',
  'connected_items' => get_queried_object(),
  'nopaging' => true,
) );

// Display connected pages
if ( $connected->have_posts() ) :
?>
<h3>Related pages:</h3>
<ul>
<?php while ( $connected->have_posts() ) : $connected->the_post(); ?>
    <li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>
<?php endwhile; ?>
</ul>

<?php
// Prevent weirdness
wp_reset_postdata();

endif;
?>