Was sent this yesterday: https://anniv.co/
Some of the anniversaries on the list are, frankly, a stretch, but some represent a good timeline of how we got where we are. In particular, an interesting bunch of 20, 25, and 30 year anniversaries this year:
- 20: Wikipedia, Wayback Machine
- 25: Internet Archive
- 30: Linux kernel, first site on the WWW.
I suspect that, when we look back in 10-15 years, the 2016-2021 years will see a flurry of interesting anniversaries around sustainable open source development, and of course I think we’ll be one of them! Thanks for being an important part of that (hopefully, eventually, historic 
journey.