Narcissists are not gregarious. Of course narcissists love to have an audience. But they love an audience only because, and as long as it provides them, with narcissistic supply. Narcissists are terrified of introspection. Proper introspection must include an emotional element, an insight and the ability to emotionally integrate the insight so that it affects behavior.
Narcissists do engage in real introspection following a life crisis, though.
They attend therapy at such time. This is not the case. It runs against the grain. This is more of a BPD trait. A differential diagnosis of NPD actually almost rests on the absence of attempted suicide and self-mutilation.