I, too, have the 1997 calendar (no way that puppy's getting thrown out or sold), and wasn't sure if there had been others before, but know there have been no others since (I look every year towards the end of the season in all of the major souvenir stands). It's at work in a drawer. Time to hang it up again. Many of my staff think I'm already insane with my updating MF webcam pic on my Windows desktop and the little informational placard about MF hanging up on my wall. The calendar will simply confirm it!
John
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"Thank you for riding [fill in name of ride], and enjoy the rest of your day here at [fill in name of park]."