Festivals & Events, York
Sometimes you get really lucky when you travel. That was the case for us as the one full day we had in York was the 1700th anniversary of the Roman Emperor Constantine's coronation, which took place in York. We came across this ceremony in front of Yorkminster. There were a number of church officials there for the occasion and they had a service in the church just before. Fun to watch and great history. I don't know if they do it every year on July 25 but I imagine they do something.
This is one of the best festivals in England. It takes place during February, and so attracts relatively few international tourists. Many aspects of Viking life are re-created, with assorted lectures, battles, seafaring, encampments, arts, crafts, and much more. Anyone with an interest in medieval history should see this. Try to book accomodations at least a few weeks in advance.