Thanks - that what I was wondering - if we would be hurried out of the park by 6 or if we could meander.
So what are crowds like on a day like this? Same, more, less?
You're welcome!
So it's September 8, huh? Hmmmm..... I am mystified as to why DL would be closing that early on 9/8.

What's happening on that day that I am forgetting? It's got to be a private event of some kind. It's certainly not Halloween-related, that's for sure.
I'm guessing this private event would probably start at 7 p.m. or so - maybe even later - but by closing the park to the public at 6 p.m., it gives DL time to get everyone cleared out. You may or may not have time to pop into a shop on Main Street and buy something. Meandering for too long won't be allowed if they have a private event to conduct soon after the 6 p.m. closing. Obviously it will take some time for all the guests to leave the park but they probably wouldn't give you an extra hour to shop or anything.
If I recall, on the CM party nights last December there was an announcement on the loud speaker, alerting the guests that
Disneyland would be closing at 6 p.m. I left just before or right at closing so I didn't see what happened after that and if the CM's working in DL had to shoo everyone out who wasn't leaving! All I know is that it's not the same as a regular night at closing, where you can meander a bit. They are closing early because they need to have the guests out by a certain time.
As for crowds - I had heard reports before my trip that Disneyland was kind of non-crowded on CM party days, but I didn't find that to be the case. It was pretty darn crowded on both of the CM party days, in my opinion. Then again, it was the holiday season so that naturally attracts more folks to DL anyway.
However, the kinds of crowds in the park on September 8 might not be as bad as the December crowds were because September 8 is after Labor Day, it's off-peak season and most kids will be back at school. Plus, so many rides are going to be closed for refurb in September. Just going out on a limb I'd say that it probably will not be terribly crowded in the daytime on 9/8.