I reckon Tues 3rd May would be good. Kids back at school in most places, people most likely to drive after a weekend. Lots of people do a small weekly shop down here.
Lets show the moronic out there how cycling changes congestion for the better, how many extra cars would be needed, and how little space there'll be on public transport. It'd be like a road block, but everyone is involved. I'm sick of being made out to be in the way of motorists just for riding a damn bike.
Or perhaps we should flood the traffic reports with fakes to cause constination, LOL!??