7.45pm – 8.45pm. Tickets £8 (£6), £1 off early bird tickets bought before 21st April. Tristan set up his natural navigation school in 2008 and is the author of the award-winning and bestselling books, The Natural Navigator (2010), The Walker's Guide to Outdoor Clues & Signs (2014) and How to Read Water (2016), three of the world’s only books covering natural navigation. Tickets available from the Oundle Box Office, 4 New Street, Oundle. T: 01832 274734 or visit website for more details.