Select Same Articulation ⇧A
Selects all events that have the same articulation as the focused? event. If the focused event has no articulation all events with no articulation will be selected. Sort of like the zero articulation.
You can use any of the standard selection techniques in the Event List: individual selection by clicking events, multiple selection by dragging, or both of these (without altering the previous selection), in conjunction with the Shift key.