8:30 Mass Saturday
https://www.google.com/search?client=firefox-b-1-d&q=cathedral+of+notre+dame+in+laon+france
Mass on weekdays at 8:00 AM, 12:00 PM, and 6:00 PM, on Saturdays at 8:30 AM, 12:00 PM, and an anticipated Mass at 6:00 PM, and on Sundays at 8:30 AM, 10:00 AM (Gregorian Mass), 11:30 AM, and 6:00 PM
https://www.google.com/search?q=cathedral+of+notre+dame+in+laon+france+mass+times&