The celebrity judges do not go to the first round of auditions. Those shows where there are huge crowds “outside” are lies. Their flunkies ask the best and worst flunkies to come back and audition at a later time.
Yes, they purposely ask the really bad, stupid and weird to come back for the second round.
I knew that going in and sometimes it took everything not to die laughing while some of the worst of the worst were auditioning.