Martin Henk and I organized
BMS Summer School 2015
Convex
geometry - discrete and computational. Speakers included
Alexander Barvinok, Greg Blekherman, Jesus de Loera, and Frank
Vallentin. Check out the poster (that I made myself)
It's not a cookie. We used kinetic sand (just google for it).
Günter Ziegler and I organized the workshop
Discrete Models in Geometry and Topology. Here in Berlin, March 23-26. With over 100 participants it was quite big.
Two years before, Günter Ziegler and I organized the workshop
Delaunay Geometry: Polytopes, Triangulations and Spheres
. Here in Berlin, October 7-9, 2013.
Arnau Padrol and I made the poster with stuff from an art supply
store. The lighting is Arnau's smartphone (you can even see him a bit
in the reflection in the sphere...).