Show Venue as filter in Search and Filter Pro plugin for The Events Calendar plugin's event post type

search-and-filter-events-calendar-venue-filter.php

<?php
/* 
* Add a post meta field in S&F plugin and select _EventVenueID and then put this in functions.php
*/

add_filter('sf_input_object_pre', function ($input_object, $sfid) {

    if ($input_object['name'] == '_sfm__EventVenueID' && $sfid == 1048) {
        if (! isset($input_object['options'])) {
            return $input_object;
        }

        $new_options = [];

        $all_venues = get_posts([
            'post_type' => 'tribe_venue',
            'numberposts' => -1
        ]);

        if (isset($all_venues)) {
            foreach ($all_venues as $venue) {
                // create a new "default" option
                $new_option = new StdClass();
                $new_option->value = $venue->ID;
                $new_option->label = $venue->post_title;
                array_push($new_options, $new_option);
            }
        }

        $input_object['options'] = $new_options;
    }
    return $input_object;
}, 10, 2);