The term event has six uses:
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Pega-System-Events class
agent
When the deadline time or goal time for an assignment is reached but the assignment remains unperformed, an escalation event occurs, and processing defined in the service level rule determines what happens next to the assignment or the work object.
A business policy exception can be automatically detected by a Declare OnChange rule associated with a flow. Such events can cause the work object to be suspended until a reviewer examines the situation leading to the exception
When a developer checks in a rule or deletes a rule, this creates an instance of the Pega-Events class and is reported on the Designer Studio newsfeed.
The Client Event Editor provides developers with facilities that control details of user interaction with work object forms, allowing the forms to respond quickly to user input. (These facilities correspond to JavaScript events.)
Each entry in the alert log is known as an alert event.