Sun 10 Sep 17 Welwyn Hatfield Museum Service, Mill Green Museum & Mill, Mill Green, Hatfield AL9 5PD Heritage Open Day: Join us for Heritage Open Day on Sunday 10 September 2017, as we take a look behind the scenes at Mill Green Museum. Tour the museum's fascinating object stores with our knowledgeable staff and volunteers. The event is combined with our Annual Murphy TV and Radio Day... READ MORE>