On Saturday 19 and Sunday 20 July, young explorers are invited to become mini archaeologists and crack the code of a mysterious Celtic message that 'may' have been left behind by the Iron Age Catuvellauni tribe, who once lived among our rolling hills. Successful codebreakers will earn their very own dig licence.

On Sunday only, join Dr Wendy Morrison, archaeologist for Chilterns National Landscape, for hands-on demonstrations, real and replica artefacts, and expert insights into what you might find beneath you.

10.00am-4.30pm.

£2 per child, no booking required.

The Nationwide Festival of Archaeology is an annual event coordinated by the Council for British Archaeology.