Order The Events Calendar events by post date (instead of event date) in the main blog loop.

functions.php

/**
 * Order The Events Calendar events by post date (instead of event date) in the main blog loop.
 *
 */
function tribe_post_date_ordering( $query ) {
    if ( $query->tribe_is_multi_posttype) {

        remove_filter( 'posts_fields', array( 'TribeEventsQuery', 'multi_type_posts_fields' ) );
        $query->set( 'order', 'DESC' );

    }
}
add_action( 'pre_get_posts', 'tribe_post_date_ordering', 51 );