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I haven't been in a couple of years, but they weren't posted at all the last time I went. I wouldn't sweat it too much, if they did't properly post at the main entrance, then how can they expect you to know? I will get in touch with the Old Settlers Association, I know several members there, and see if they posted it, or if it was the rides contractor.
The reunion used to be a week long event and they have shortened it to just 4 days now. If I get any information, I will pass it along. The members that I know are not anti 2A, and so my best guess is, since the signage was on a ticket booth, that the rides contractor is responsible for the signage.