If you'd like to join a game on TTS, please make sure you've played the tutorial so you get a hang of the controls.

Also, if you're interested in any of the free games you can use with TTS, check TTS's Workshop here: https://steamoss.com/app/286160/workshop/
(Or go to the game in your library and navigate the Workshop from there.)

Please make sure you've tested out/played one of these games before the actual event. ;)