Johannes Gehrke gave a keynote on January 20, 2011, at the opening ceremony for the special research thrust SFB 876: Providing Information by Resource-Constrained Data Analysis at the Technical University of Dortmund.

He gave an invited colloquium in the Department of Computer Science at the Technical University of Munich on December 2, 2010, titled "What Can Database Systems Do For Computer Games and Simulations?"

Johannes Gehrke also gave an invited colloquium in the Department of Computer Science at the Ecole Polytechnique Federale Lausanne on November 29, 2010 titled "Scalability for MMOs and Transaction Processing".