Details about Snowmass 2021 can be found on the official page: https://snowmass21.org/
The European Strategy Group (ESG) process has nearly completed. The next major decadal strategy effort is the US Snowmass process, which will be followed by P5 recommendations, which in turn will guide funding and resource decisions.
The first issue for the US Snowmass process is the submission of short 2-page LOI's by Aug 30th and longer documents before summer of next year (2021).
The following LOIs have been proposed: