I am not affiliated with this event and nothing I write is authoritative for it.

Originally posted by details
Teams of 10 (4 Hackers + 6 TF2 players) will compete to score more points than their opponents during each 30 minute match. The goal is simple: score more points than your competitors. How you do that is where the challenge comes in. The six TF2 players will be frantically trying to kill, capture and win rounds against the opposing TF2 players. (Keep an eye out as the machines try to take over TF2.) At the same time, the four hackers will be attempting to solve a variety of hacking challenges. As tasks are completed, credits in our ‘hackconomy’ are gained. These can be used to purchase effects to help your team or hinder your opponents in both hacking and TF2.
Site: http://hackfortress.net/
Twitter: https://twitter.com/tf2shmoo