Hi and welcome to the forum
As it happens we're having a meet on Dartmoor that weekend, starting at Betty Cottles just outside Okehampton on the Saturady morning. Some of us are camping there on the Friday and Saturday night. It's an easyish tramp with kids and dogs and possibly sausages on the Saturday, plans for Sunday are 'fluid', i.e I don't think there is one yet!
Also, if you head over to the 'welcome' section and post there, you'll get lots of very friendly people saying hello