Right, naturally none of the rocket launches in the demo data set are recurring (perhaps one day...). In another calendar with recurring events, that ID will be a consistent string across all events that are part of the same series. It's pulled from the `recurringEventId` field in the Google Calendar API: https://developers.google.com/calendar/v3/reference/events#r...

At the moment, the tool just syncs events from one month in the past through one month in the future, so it will pick up a finite subset of a potentially infinite series of recurring events. In future iterations, we imagine users defining their own timeframe to sync.