Issue Summary

Per What migrates with the Confluence Cloud Migration Assistant,

Team Calendar components that are not migrated:

• Internal subscriptions: In Confluence, a Team Calendar is linked to a specific space. Internal subscriptions lets a team view events from a different space's calendar, right inside their own Team Calendar. Internal subscriptions are not migrated. After migration, your Team Calendar will still have all its own events, but won't show the events from other spaces' calendars that you had subscribed to. To get those events back, you'll need to set up the internal subscriptions again in the cloud.

Suggested Resolution

I would like to see calendar subscriptions migrated and remigrated if space is deleted and migrated again. Maybe this could be handled similarly to issue links in JCMA where once both "sides" of the subscription are migrated, the "link" is created.

Workaround

To get those events back, you'll need to set up the internal subscriptions again in the cloud.