We have the Watching Project, you know, Dr+k9, and while it's no longer a day-for-day by-the-calendar viewing, we do watch it all together and make what we hope are interesting comments.
I actually had favorite conditrions set up for my weekly Dr Who viewings in the 80s, I tremember graprfruit jiuce and white or dark chocolate working out nicely, asometimes with vodka, but nothing comes back to me for DS. I suppose we had no time to make elaboarate arrangements, being lucky if we could just manage to catch it from the beginning while breathing hard from the running.
Now? I try to stay steady with the Watching Project, so I stop myself from watching more than two at a time usually, occasionally three. Sometimes I've been marathoning a different timeline also, while WPing. Then I can't stop with three.