On the Bentley Events and Webinars page https://www.bentley.com/en/global-events/events-overview you can find many upcoming live sessions and on-demand webinars and trainings. Below is a list of recent OpenGround Cloud focused SIGs from the Geotechnical Information Management SIGs. A list of Geotechnical Information Management SIGs focused on gINT can be found here.
Note: as of January 2021 North America SIGs are on a new platform. SIGs January 2021 and moving on are posted on the Bentley Learn Server.