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Don't forget that things like this also require corner workers, "race" officials, ambulance crews etc. I like the idea of after hours fun activities but from the track perspective they can turn into a lot of work and need at least a few volunteers and possibly some paid employees to make them happen.
I wish it was as simple as the days of our youth when a bunch of guys showed up in a parking lot without asking permission of the lot owner and whipped around for a few hours until we got tired or politely asked to leave. Today's sue happy society though ruins things like that especially from the perspective of the possibly sued entity.