Encryption Compatibility with Event Series
Where: This change applies to Lightning Experience and all versions of the Salesforce app in Enterprise, Performance, Unlimited, and Developer editions.
How: On the Encryption Policy page in Setup, click Encrypt Fields, and encrypt the Activity (Task and Event) Description field. From now on, your event series in Lightning Experience and the Salesforce app are also encrypted.
Historical event series data remains unencrypted after you enable Shield Platform Encryption. To encrypt existing event series data in Lightning Experience, update your event series records. Updating synchronizes existing event series data with your active key material.