The mass itself aims to gather at 6.30 though rarely leaves before 7 (or is it 7.30 some times?)
This month, and probably other months too, some people are inviting each other to a pre-drink or just gathering:
Meet at Bernie Spain Gardens for a drink from 17.30pm and join Critical mass later on.
Upper Ground, SE1 9NW London, United Kingdom
Hi,
i have heard that the busy people at Crossrail are planning to deliver hundreds of tons of concrete to Farringdon station, beginning at 6pm tomorrow evening. That’s lots of lorries with overstressed drivers. Best keep out of the way. When I get details of the route I will tweet to @LDNcriticalmass
Sadly @LDNcriticalmass doesn’t seem to be in use any more. Try @CMassLondon