It doesn't matter!
You can get there and have 30 people show up the day before, or get there and have 30 people leave the day before.
There could be 20 people there and you still don't get the job (when they hire 25), or there could be 150 people there and they hire you (when they only hire 4).
Your chances don't change based on the number of people there, your chances change based on your attitude - ONLY.
Alright Batman....
Seems you're the one that thinks he knows everything