The Hexham Market is from 9-1.30, and should be followed up with a visit to the Vintage Fair in the Trinity Centre, just up the road from the Market, from 10.30-4.30. This is part organised by the wonderful people at the Hearth in Horsley, and will feature clothes, textiles and fabrics for everyone.
If you have time you could also take in the Barrasford Arms Marrow show. It is a great pub, with the best atmosphere, delicious food, and nice people. Worth going along to, even if only to support the Great North Air Ambulance, to which the proceeds rightly go to in Air Ambulance week.