You can look at it like one of those logic puzzles if you want.
November is chock full of Christmas Parties, so I'd bet on three a week - so that means at least three 7pm closings on the weeks leading up to Thanksgiving. Right now, the parties are scheduled for Thursday, Friday and Sundays. So you know there won't be late EMH those days. EMM is scheduled for Sundays and Tuesdays in October, so you can guess that's where they'll end up in November, so that means no morning EMH on Tuesdays, Thursdays, Fridays or Sundays because I don't think they put morning EMH on early close days -- most of the year they're on Friday, though. So that leaves Mondays or Wednesdays for morning EMH once the Christmas party takes Friday. Since they don't put them both on the same day, and through October late EMH are Wednesdays, my guess is you'll get a Monday early EMH and a Wednesday late one.
I could be wrong, of course, but if you wanted to bet, that's how I'd bet.