Custom login URL for RSVP and Tickets

functions.php

<?php

/**
 * Filter default login URL for Tickets and RSVP
 */
add_filter( 'tribe_tickets_ticket_login_url', 'rt_et_custom_login_url' );

function rt_et_custom_login_url( $url ) {

	$parts = wp_parse_url( $url );

	$new_url = 'http://Yourlogin.com';

	if ( isset( $parts['query'] ) ) {
		$new_url = $new_url . '?' . $parts['query'];
	}

	return $new_url;
}