Add event categories to you recent bookings

<?php
/*
 * paste in your theme functions.php or wp-content/mu-plugins/function.php
 * After adding in your functions.php, go to Events > Bookings > Recent Bookings or by clicking on the Event
 * click on the Gear icon and drag&drop field "Event Categories"
 */

function my_em_bookings_table_cols_template_event_categories($template, $EM_Bookings_Table){
    $template['event_categories'] = 'Event Categories';
    return $template;
}
add_action('em_bookings_table_cols_template', 'my_em_bookings_table_cols_template_event_categories',10,2);

function my_em_custom_booking_form_cols_event_categories($val, $col, $EM_Booking, $EM_Bookings_Table, $csv){
    if( $col == 'event_categories' ){
		echo '<ul class="event-categories">';
        foreach($EM_Booking->get_event()->get_categories() as $EM_Category){
			echo '<li>'.$EM_Category->output("#_CATEGORYNAME").'</li>';
		}
		echo '</ul>';
    }
    return $val;
}
add_filter('em_bookings_table_rows_col','my_em_custom_booking_form_cols_event_categories', 10, 5);