The plain Event is able to catch signals. You can use the event in the Designer as an intermediate event or as a boundary event:
Intermediate: You can use the object as an intermediate catching event. In this case, the event is a separate process step where the process must wait for a specific trigger.
Boundary: The signal is associated with an activity. The event listens to a signal being fired while the associated activity is active.
Trigger Events: Use the attribute Trigger Events in the Attributes Panel to define which button of a form associated to the element triggers the default process flow of a BPMN process. This attribute is only available for boundary events.
Execution
On Exit: Without input or output parameters.
Editing and Styling
Go to Working with the BPMN Editor for further information regarding editing of BPMN elements using the different context menus on the diagram pane.
Go to Styling BPMN Elements for further information regarding styling possibilities for BPMN elements, for example how to change the background color, the font style and size etc.