[sending this independently to python-dev and core-workflow]
I have promised Ned that we will not migrate before 3.6.0 is released and not for a week following in case an emergency 3.6.1 is necessary. I also promised Larry we wouldn't migrate the week before 3.5.3 is released. That means the windows for migrating are 2016-12-30 to 2017-01-09, and then any time after 2016-01-16 (this of course assumes all release schedules don't slip).
So if the above wasn't clear, if you want to help then please help with the b.p.o issues as those are the remaining blockers I can't deal with on my own. And I actually have GitHub-themed gifts I bought myself sitting under my Xmas tree that I won't open until we migrate, so let's not take too long. ;)