If we're talking re-enacting the way the folks who wear historish costumes and blank-fire muskets at each other mean it, then the cutoff is "whatever the last war was fought locally and then ended."

If you mean it the way the folks who wear even sillier costumes, drink, and walk around with swords mean it, then the cutoff is "whenever the clothes we want to wear were last plausibly worn."

If you mean it the way a TV reporter, producer, or academic might mean it, however, there's no cutoff beyond "isn't happening now.". (There's a famous story about someone who won the lottery after playing on a whim, was egged on by a reporter to re-enact buying the ticket, and won again.)