@janrifkinson No, if you want to create a vivaldi.net calendar utilizing the Vivaldi servers you need to pick Vivaldi.net as your account type and input the credentials for your Vivaldi account. Visit https://webmail.vivaldi.net to create calendars and import iCal files.
Screenshot from 2021-01-11 19-26-37.png
@janrifkinson We gotta distinguish between syncing and importing. Importing is independent from Google server, we’re just using iCal files that can come from anywhere. If you are creating a calendar on Vivaldi Webmail Calendar server and import to it, the events should be synced to your other devices. If you import into a Vivaldi browser calendar directly, there seems to be no syncing. It’s all a bit unclear.