Allow Custom Fields Events Calendar PRO 2.0.11

/**
 * Allows the custom fields meta box to display in the event editor -
 * the relevant setting also needs to be checked in the Screen Options
 * pulldown for the event editor.
 */
function allow_tribe_custom_fields() {
    if (tribe_get_option('disable_metabox_custom_fields') !== 'show')
        tribe_update_option('disable_metabox_custom_fields', 'show');
}

add_action('init', 'allow_tribe_custom_fields', 1);