Hey look, this little bastard has a question. Let's all pelt him with stones.
So I haz question: If all 128 people sign up for a certain day, wouldn't the entire Smogon server become overcrowded? I mean, with 128 people, and all the people who want to spectate, and all the people who are already there, I think it would overexceed the maximum occupancy of 500.
These are live tournaments. It's been mentioned several times in this thread that you must be present at the time of the tournament to post in the specific registration thread for that day. Just look at this forum for an example.
Almost every possible question has been answered by someone in this thread. I recommend anyone who has a question to read through it before posting.