On the weekend before the IETF meeting in Prague (July 18-19), we will hold our second IETF Hackathon event. Improve the Internet with new software, new networking technology, or further developments of open source platforms. With your colleagues and partners! This is a community effort. What would you like to work on? Add your topic to the wiki, and register to the event! More information at in my blog article at http://www.ietf.org/blog/2015/05/ietf-hackathon/ and the event home page at http://ietf.org/hackathon/93-hackathon.html. Jari Arkko, IETF Chair