It's a big ol' livestream TTV has once a year (I think?) and the cast talks about Bionicle n' stuff and takes questions and does trivia giveaways where if ya get a question right then ya get a super-cool Bionicle-related prize, meanwhile the people who watch the stream compete in an unspoken but actually existent thing where you must try to get a cast members attention and somehow get them to give you a shoutout so you can feel content in life and think you'll become super famous and popular either though it does absolutely nothing to your social status. The rules are pretty basic as it's just no swearing, have appropriate behavior, etc, etc. But there is one not basic rule that if you break Eljay will hunt you down and shoot you with Barraki Squid Launchers for. Never, ever, EVER say Solek or Ketar in the chat in any way or form. The reason why is only known to those who have dug deep enough into TTV's past. But that may pretty much be it.
In other words, it's an online Bionicle convention.