Event handler records, for different event handlers in different domains, are stored in an event handler orchestrator service. The event handler records identify event handlers (in various domains) that are to handle events raised in separate domains. When an event is raised, the event handler records are filtered to identify an event handler that has indicated an interest in the raised event, and an end point corresponding to the identified event handler is provided back to the calling process. The calling process then invokes the event handler for which the end point is returned.