From the Drought.gov website:

The virtual 2021 National Soil Moisture Workshop provides a unique opportunity for leaders in soil moisture research and development to come together in an interactive workshop format to exchange ideas and develop collaborations. This will be the eleventh consecutive year for the workshop, which is an initiative of the community of researchers that developed the Marena, Oklahoma, In Situ Sensor Testbed (MOISST).

The workshop is free, but registration is required: https://www.drought.gov/events/2021-national-soil-moisture-workshop.