Where can I find out about Social Networking Events like the T-Mobile ad?

[Amy B]

This Friday, two of my friends and I are going to London and we want to be part of a Social Neworking event like the silent rave the other day and like the T-Mobile advert where loads of people are told to go to one place all at the same time and do something. Do you know where I can find a website that does this ?
I don't want to do anything illegal. I've just heard of people meeting up in London and doing something like the silent rave the other day.

[Ray L]

That was arranged purely as an advert with professional dancers, the fact that some of the public did join in was a bonus.
You will not find any prearranged events, as they would need to inform the authorities to get permission, as it would be likely that thousands would turn up and make uncontrollable.
There are the occasional illegal events, which usually end in problems, assaults, drunks etc.