Dconf "joker seminars"

[Mike Parker]

On Saturday, 16 October 2021 at 14:24:50 UTC, Steven 
Schveighoffer wrote:

> Aside from Scott Meyers (twice), we have had guest keynotes 
> from Martin Odersky (Scala), and we were scheduled to have a 
> keynote from Roberto Ierusalimschy (Lua) before Dconf 2020 was 
> cancelled.

Scott Meyers
2014: https://youtu.be/KAWA1DuvCnQ
2017: https://youtu.be/3WBaY61c9sE

Martin Odersky
2018: https://youtu.be/uiorT754IwA

Others have been invited in other years but declined. I was 
really happy we were able to get Roberto for 2020, and I'm still 
bummed that we had to cancel.