If anyone is in the netherlands next week, join us: https://meta.mathoverflow.net/questions/4270/what-do-you-want-to-do-in-september-for-mos-tenth-anniversary
On Sep. 28, 2009, MathOverflow went online, and has almost ten years of almost constant operation, thanks to StackExchange.
There will be an obligatory post observing the anniversary. The board of MathOverflow LLC might hold a toast (with coffee and tea) in observance as well, and they may yet ...
@Thomas, that was why it was tagged as featured. It should appear as part of the community announcements. However, if I think of an appropriate main post, I will include a link to this post. Gerhard "Thank You For The Suggestion" Paseman, 2019.09.18. — Gerhard Paseman5 hours ago