A lot of Dan's posts on the main page contain dates on which specific churning-related events, deadlines etc are to take place.
For example, Dan often writes about signup bonuses coming to an end, or deadline to add a certain feature to your card, deadlines to book on certain airlines, routes ending etc...
Why doesn't someone (Dan should, but he currently doesn't) compile all of these dates in to a shareable Google Calendar for the community's convenience? To make it worth your while, you can sell ads on various days for advertisers ("Sale at Yankel's Bakery today!")
Whoever wants to claim this project just say "Aye"
Shana Tova