Someone with a commercial eye would be selling scarves, lampshades, those paper things you can put round cakes... the possibilities are endless. I wonder if you're allowed to hawk round the stones. I bet there were always people selling souvenirs and greasy snacks at Avebury - it must always have been an interesting and strange place to be. Imagine when the ditch looked like this! It's scarcely believable. The font (pushing a mere millennium) is a spring chicken compared to the 4500 years of the bank and ditch.
By the way, don't think those are dragons being molested by Saint Whoeverthatis (Michael, probably). They've only got front legs and so must be wyverns, a different species entirely.
Image copyright Rhiannon 2015