Hi Ash, that should be possible – does the following snippet (which you might add to your theme’s functions.php file) help out here?
add_action( 'parse_query', 'remove_events_from_tag_query', 75 );
function remove_events_from_tag_query( $query ) {
if ( ! $query->is_tag || ! is_array( $query->get( 'post_type' ) ) ) return;
if ( ! in_array( TribeEvents::POSTTYPE, $query->get( 'post_type' ) ) ) return;
$types = $query->get( 'post_type' );
foreach ( $types as $index => $post_type )
if ( $post_type === TribeEvents::POSTTYPE ) unset( $types[$index] );
$query->set( 'post_type', $types );
}