That's funny Smitty. But depending on where you are in the country there may be really good sites available from such events. I've found accounts in old papers about such events being suddenly interrupted by torrential storms which might have created opportunities were the sites still available and not developed. Billy Sunday, gospel preacher held tent revivals near here often and those sites have been hunted though not much remains of the original ground.
Think about the early settlers, usually religious and usually stopping on Sundays for services in many parts of the country. They did not have a lot to give but they did occaisonally lose things. My Uncle's farm was such a stopping place for the early settlers in this part of the country. A nearby parsonnage held services for travelers for some years back in the day. A few implements and large cents have come out of his field but his field was an orchard used only by the larger groups, most groups stayed in the neighboring field, closer to the parsonnage.
Find those old crossroads, orchards and groves where early settlers stopped for Sunday during their transits west and they might be good hunt sites.