Unable to make changes to single event page

I really messed up by applying if else if condition in
single-ai1ec_event.php file.
I have different three footers for different subject and i categorized events accordingly.
For example i have three different event categories having ids 38, 39 and 40.
I want different header and footer when their single events displays.
on single-ai1ec_event.php template file i made so many changes but only first condition is true.
Its showing header & footer for category 38 to all other categories events.
Same conditional statements i applied in other template is working.

<?php if (is_page(156) || in_array(156, $post->ancestors)) { // Beachmenu condition here you can edit ?>
<?php get_footer('beach'); ?>
<?php } elseif (is_page(161) || in_array(161, $post->ancestors)) { ?>
<?php get_footer('night'); ?>
<?php } elseif (is_page(160) || in_array(160, $post->ancestors)) { ?>
<?php get_footer('after'); ?>
<?php } else { ?>
<?php
get_footer();
}
?>

In single-ai1ec_event.php file i am using below code

<?php global $ai1ec_events_helper;
$args=array(
  'post_type' => 'ai1ec_event',
  'taxonomy' => 'events_categories',
  'term_id' => $term_id
);

$post = new WP_Query( $args );
if ( $term_id = 38 ) {
include(TEMPLATEPATH . '/single-beach.php');
}
elseif ( $term_id = 39 ) {
include(TEMPLATEPATH . '/single-night.php');
} 

elseif ( $term_id = 40 ) {
include(TEMPLATEPATH . '/single-after.php');
 } ?>

Sometime all conditions showign true and sometime only first condtion is true for all event single page.

Need your help
#mysite
and see on each event page. Reply me as soon as possible

I love this great plugin but i have inconsistent footers.
Please Help me in this case.

Thanks

https://wordpress.org/plugins/all-in-one-event-calendar/