Richard Dawkin's real name is Clinton Richard Dawkins, so he did sign in with his real name. Considering also he is a well known public figure amongst Christian and Atheist circles it would be a bit hard for him to 'sneak in'.

Mathis states that there was a computer glitch on their website in regards to RSVP's (Whether or not the glitch actually existed we will never know.). So therefore PZ Myers did indeed sign up and was accepted to attend. If there was a computer glitch that isn't his fault and should not have been penalized for it.

Considering that both Richard Dawkins and PZ Myers both starred in Expelled, they had a very good reason to be there. It is standard industry practise to give free screenings to those that are involved in making a movie.
So why are they the exception?

Dawkins signed in with a false name?

He engaged in deceit? Really???

I wish his loyal readers were aware of this.