The situation with the novel coronavirus (covid-19) is changing rapidly, so first of all we want to repeat that if you have any questions, please contact Green Action Week early in the process and we intend to be flexible.
Our general advice when planning activities is to proactively adapt to the situation caused by the virus, rather than postpone, cancel, or assume it will not affect you.
In the email you have received from Consumers International and SSNC you should have the link to a support document with more advice specifically for planning with covid-19 in mind.