gistfile1.txt

add_action( 'wp_head', 'custom_event_meta' );
function custom_event_meta(){
	// reregister meta (this will merge settings into the original registered settings)
	tribe_register_meta( 
		'tribe_event_website', array(
			'classes'         => array( 'meta_before' => array( 'url' ) ),
			'label' => __( 'Register Here:' ),
			'register_overwrite' => true, // set to TRUE in order to overwrite the core registration
			'filter_callback' => array('Tribe_Register_Meta', 'event_website'),
			'priority'        => 50,
			'group'           => 'tribe_event_details'

		) 
	);
}