The term event has six uses:
Business events are deprecated.
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 item.
A business policy exception can be automatically detected by a Declare OnChange rule associated with a flow. Such events can cause the work item 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.
Each entry in the alert log is known as an alert event.