AMC instituted an outright ban on face-covering masks and fake weapons. It also said that patrons wearing costumes that “make other guests feel uncomfortable” would not be permitted inside theaters.
The L.A. Times reports that Regal Cinemas, the larger of the two chains, was more vague about changes to its costume policy. A representative stated only that ticketholders “should expect stricter controls over character attire and accessories at our theaters,” but declined to provide further details.
…Which sucks; but then, so do punitive lawsuits, which is what theater chains will be facing if there’s another attack like this. Note that Regal is probably going to end up with more practical restrictions than AMC: “vague rules” = “less tolerance for pushing the envelope.” At another guess…
PS: Believe me, I’m no happier about this than you are; and I’m no more happier about this outcome as I am any other outcome from yesterday’s atrocity.