Pilgrim, you are welcome in the Chartres Cathedral.
A few reminders:
Never forget you are a guest. Cultural and religious sensitivity are always appreciated. This is a UNESCO World heritage site, but it’s also a Catholic church in semi-rural France. Keep in mind how you would like a visitor to act when they come to your spiritual home.*
Feel free to join in the worshipping life of the community. You are welcome at the services. To find out times and locations, check the notice boards by each entry. Vespers, which is sung each weeknight evening at 19h00, is an ecumenically-oriented service.