The Events Calendar - Yoast SEO - Prevent Yoast from changing Event Title Tags for Event Views (Month, List, Etc.)

tec-yoast-remove-page-title.php

<?php
// Prevent Yoast from changing Event Title Tags for Event Views (Month, List, Etc,)
add_action( 'pre_get_posts', 'tribe_remove_wpseo_title_rewrite', 20 );
function tribe_remove_wpseo_title_rewrite() {
    if ( class_exists( 'Tribe__Events__Main' ) && class_exists( 'Tribe__Events__Pro__Main' ) ) {
        if( tribe_is_month() || tribe_is_upcoming() || tribe_is_past() || tribe_is_day() || tribe_is_map() || tribe_is_photo() || tribe_is_week() ) {
            $wpseo_front = WPSEO_Frontend::get_instance();
            remove_filter( 'wp_title', array( $wpseo_front, 'title' ), 15 );
            remove_filter( 'pre_get_document_title', array( $wpseo_front, 'title' ), 15 );
        }
    } elseif ( class_exists( 'Tribe__Events__Main' ) && !class_exists( 'Tribe__Events__Pro__Main' ) ) {
        if( tribe_is_month() || tribe_is_upcoming() || tribe_is_past() || tribe_is_day() ) {
            $wpseo_front = WPSEO_Frontend::get_instance();
            remove_filter( 'wp_title', array( $wpseo_front, 'title' ), 15 );
            remove_filter( 'pre_get_document_title', array( $wpseo_front, 'title' ), 15 );
        }
    }
};

Suggest adding a check to make sure the Yoast plugin is active, first and foremost.

function tribe_remove_wpseo_title_rewrite() {

  // Bail if Yoast isn't active
  if(!defined('WPSEO_VERSION'))
    return null;
  
  // the other stuff....

}