Collecting expressions of interest in a rationality conference in August

On the principle of organising events that I want to attend myself, I would very much like to organise a rationality conference/​convention in the UK. I organise events for a living; in addition, in my free time I’ve organised five ~200 person weekend conventions and several other events.

At the moment I am thinking of a one day event on a weekend or a Friday in August, at Stamford Bridge or somewhere else easy to get to around London. There would probably also be a pre-conference dinner, or private bar night with music.

Costs would be in the region of £50-£100 a head including lunch.

Can I get a show of hands to see if the idea is viable?