
Onstage
Theatrical Use
Onstage specifically refers to being in view of the audience during a live performance, like a play or concert. 
Visibility
Use 'onstage' to describe actions that are meant to be seen by spectators, not what happens behind the scenes. 
Live Performances
'Onstage' often implies that the event is happening in real-time, without edits or do-overs. 