>Was Avebury perhaps a site of multiple use - a place to corral livestock, to trade it

Millions of deer swarm down the vale and leap over the bank to fall into a deep ditch with pointy sticks at the bottom.
People hiding behind stones shooting arrows and spears as they tumble over the bank.

Grubs up!

McRudolf burger special, buy one get the second for the same price! Whatcha got to trade?