Cambridge Rise for Climate is part of a global day of action on Saturday 8th September. More info here: https://riseforclimate.org/
Details of the Cambridge event can be found at Rise for Climate Cambridge, but in brief there are stalls from 11 till 2 with a street theatre performance at 1:30, and a rally with speeches and a march starting at 2 in the Market Square.
Thousands of groups around the globe will 'rise' to demand a free and fair transition to a fossil free future, just ahead of the Global Climate Action Summit in San Francisco. This summit aims to put the world on track to meet the goals of the historic Paris Agreement. The summit will showcase climate action around the world and put pressure on local and national leaders to do much more to keep fossil fuels in the ground and build 100% renewable energy for all.