https://meetingorganizer.copernicus.org/EGU21/sessionprogramme 

July 11 - 16, 2021. Boulder, Colorado, USA. https://www.uspermafrost.org/21rcop/index.shtml

is postponed to June 20-24, 2022. Lanzhou, China. http://icop2020.csp.escience.cn/dct/page/1