in response, around 1500 cyclists took to the streets in november, bringing central london to a standstill, and making it impossible for the police to enforce their crazy repression.
you don't have a lot of time to organise, but if you want to build a similar event, it's up to everyone to spread this news far and wide - leaflet, poster and recruit your local cycle shop, write to your local newspaper ("local person intends to defy police ban by cycling on friday"), swamp your mailing lists, and so on and so on.
remember, the critical mass is not an 'organised' event, and so cannot notify the police in advance of its route. since it's not organised by any one person, it means everyone who wants a mass needs to do something this week to make it happen large! no-one will do it for you.
so start acting, and think positive and huge - if 1500 can come out on a cold november night over this issue, think how many might turn up on a pleasant may evening?