Hi Stefan,
A snippet like this one – which you could add to your theme’s functions.php file – ought to do the trick:
add_filter( 'tribe-events-bar-filters', 'modify_location_filter', 100 );
function modify_location_filter( array $filters ) {
if ( ! isset( $filters['tribe-bar-geoloc'] ) ) return $filters;
$filters['tribe-bar-geoloc']['caption'] = 'Location';
$filters['tribe-bar-geoloc']['html'] = str_replace( 'Location', 'Enter Nearest City,State', $filters['tribe-bar-geoloc']['html'] );
return $filters;
}
Does that help here?