In Salesforce, mail merge fields for the Event object do not populate when sending emails using the Send an Email button, when testing merge fields, or during mass email sends. This occurs because Event merge fields are designed to work only when triggered by an email alert that is configured within a Workflow Rule on the Event object.
For example, if you create an email template with the merge field {!Event.Subject} and send it manually using the Send an Email button on a record, the field will appear blank in the sent email. The same template will populate correctly if triggered by a Workflow Rule email alert on the Event object.
This article explains how to create a sample Workflow Rule to correctly use and test Event merge fields in email templates.
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