There was a delightful conference in Copenhagen
celebrating that event,
and I was lucky enough to attend. The slides of my talk live
here:
http://herpolhode.com/rob/ugly.pdf
I flew back the next day, September 10, 2011, and it was a beautiful
clear night with a stunning view of the city. We sat in the last row of
the plane, and had an unobstructed view of the trade towers as we landed
near midnight. We went home, fell asleep, and were woken by a phone call
about 9am.
Cripes... I remember it well.
-- Dave