Importing existing events
Go to this website and sign in with your google account.
Select your calendar you want to import events from at the top and set the date format to this:
Don't check any other boxes.
Download the CSV file and upload it to Marvin in account -> import.
Importing multiple calendars
You can select each calendar separately to import them into different subcategories in Marvin.
To do this change the name of the "Events" folder that gets created after each upload to the name of your calendar (e.g. Personal, Work etc).
In the end you can create a new main category called "Events" and drag all the other categories in there to create subcategories for each calendar.
Syncing events created in GCal
Our native sync with GCal is not ready yet, but you can use a service like Zapier to have any new event in GCal get added as a task in Marvin.
Check out this video on how to set this up: