If Patricia Sophia should really go home at the end of the concert, the story of the Sam event must be told in a rather bumpy manner to give Sam and Sophia time alone. I know you believe the invitation from Cathy forces you to write the story like this, but Sophia may have simply forgotten the invitation, especially since she is in a romantic mood right now. Until a call from Liam reminds her of it again. I find this way much easier to tell than to find a reason for Patricia remaining the chauffeur.There's the Cathy and Andy event afterward. That's why I've been saying Sam wont be giving Sophia a lift home, and it's far more likely that Patricia will be the one giving her a lift.