Copied, pasted, and modified from the event page:
"On Saturday, 8/11/12, please drop whatever you're doing and play some TF2 with your fellow VGFers. If you are to play any game Saturday, let it be this. Event lasts all day, and if you see someone playing something else, feel free to ridicule them until they put you on ignore and/or start playing TF2 instead (you can set your status to offline to avoid this while all Steam features not related to chat will remain operational).
If you insist on not playing a free to play game for one lousy day, at the very least use the group chat feature during the event (all day Saturday).
For those of you who do not know already, you can join the group chat room either by clicking the arrow next to the VGF group in the group tab of the friends list and selecting "Join group chat room," or click use the "Enter chat room" link on the right side of the VGF group page, or click on "# in chat" at the top of the VGF group page. For those of you who prefer voice chat, I recommend creating a separate room by clicking the arrow next to someone's name and selecting "Send message..." and then click the arrow on the box that pops up and select "Start voice chat" and then you can invite other people who want to join in by selecting "Invite to chat room" after clicking the arrow next to their name. This way, people who do not want to hear voices while playing games will not have to, and people who do can. Be sure to keep the VGF group chat tab open as well (Steam allows access to multiple rooms at once) so that you'll still be able to receive messages from people not in your special little voice chat room.
3Fox will not provide prizes for this event."