I for one could never consider attending.

The flying spittle from the rabid preechers, frothing at the mouth and screaming "Allibabba upyaassa" every second word would require the use of a wetsuit.

Then there is the bums in the air, stench of filthy muzzos

The retards and low IQ moorons wandering about, bumping into everyone and finally

The drug runners, criminals, rapists and pedophiles attending would disgust me no end.

I would suggest however, that the police photograph every single person attending and the prosecute each and every one for consorting with known criminals.
It would be a great boon for the police to be able to arrest so many criminals in the same place at the same time.

It would also remove many potential and probable terrorists in one big hit.