8 separate points in this comment, and 9 upvotes. I can't tell which of your points has community support, so I'm discounting all of them.
That's a shame - I'm losing a lot of information. Next time, 8 separate comments?
PS: "discount" != "ignore"
I would-have-upvoted-in-isolation 3, 4, 5, 6, and 7.
Design sketches
1. Notes on differences between these images and what we're planning on implementing:
2. Meetup widget in sidebar, listing the 5 nearest meetups occurring in the next 2 weeks, linking to:
(something like right-click & "Open Image in new tab" will help here)
3. New headers: