what happened to anti-Horowitz people once it came to getting in the door. I doubt that any signs or blatant displays were permitted. Security was pretty tight. Not sure if restricting admission to a speech is a violation of any sort unless the speaker is a public official and even then, there's a general recognition that the official's security trumps public access.
I agree on Afghanistan.

BTW, I took short movies of the demonstration with my cellphone, but I don't appear able to turn them into anything I can share with the public. The file format is 3G2 and YouTube needs MP4's.