All the men At Blanche's Party are 'Invited' by Blanche from her guest list she shows to Dorothy, but when she is stopped by Derek, Blanche introduces herself to him, if he was invited to the party by Blanche, then why does he say that he doesn't know any of the women here, he should know Blanche, and if he wasn't invited Blanche should have asked him why he is there or who invited him to the party.