Well, only the one night:
Lessee, this was post my car wreck, so 1992/3-ish?
At the time, I’d taken a summer shift in Disney Clothiers, on Main Street (about halfway up the right hand side of the street, in a building with shared access to, in order, the Camera Shop, China Closet, Silhouettes, the glass shop and a plush shop at the top of the street. This becomes important later).
My shift started at 1850, and was due to end at 0200 (in the summer, the park closes at midnight and Main Street is “officially” open until 0100. Of course, if you’re in the Emporium, you’re lucky if you get the last guest out of there half an hour after that. But I digress. The extra hour on the clock was time to close the registers - count cash and balance them - clean up the shop, drop off the cash at cash control and still have fifteen minutes to change out of your costume and get to the time clocks to clock out).
Because it had been a warm night, and therefore slow in Clothiers, we were down to two registers. The upper shops had already closed, so we were able to lock everything down precisely at 0100. I was up front counting one of the registers, and my Lead (manager) was counting the other, when we got a phone call.
Michael Jackson had just come in the park and wanted to shop in our block of shops. Put the money back in the tills, reopen the register, and wait.
Mike (the Lead) wanted to send everyone else home, but that wasn’t allowed. So he took the register he’d been counting out into the back and finished closing it, leaving me up front.
Jacko came through Clothiers in a whir, and walked up to the China Closet. He proceeded to spend nearly an hour window-shopping, and bought nothing. During this time, we had literally nothing to do - Clothiers was clean, everything was restocked (better than we generally had a chance to do it); Mike even had one of the guys clean the brass - not our job, but we were out of our skulls with boredom/exhaustion.
I was finally allowed to close my register at 0225, when Michael left through the China Closet back entrance. He had not bought anything.
We clocked out at nearly 0300.
(Boy, that was long.)
Tuckerfan -
Disneyland is, and has been as far back as I can remember, a 24/7 operation. Now, there was one day, back in the 1990s, when there was a tornado in downtown Anaheim that the park ended up closed due to weather. But the Riots didn’t close it. 911 didn’t close it.
It’s possible Jacko was there early, before park open; or that there was something else going on - it’s also possible that someone got a lucky shot.
Jacko could easily have arranged a “private party,” but those are at night, after regular hours, and just about anyone can arrange them. Some corporations even do them as fundraisers. (No, I don’t remember - if I ever knew - the cost of an evening party.)
Of course, the above is AFAIR. YMMV.