I just noticed (a little late!) That Cathy's invitation significantly limits the possibilities of what could happen between Sophia and Sam at Sam's concert. No after-show party, no strolling on the beach while the sun is going down, no long kissing or fumbling around in the car. Sam could sing a song for a woman in the room (how embarrassing) or ask Sophia to go on stage to the keyboard (only interesting when Sophia is standing there in sexy clothes and the whole room is holding its breath). And backstage? in a bar? At the moment I see this concert evening more as a vehicle for interactions between Elli and Patricia in which Sophia is the audience. Sam is able to expand his romantic relationship that evening but has little possibility of ACCESS to Sophia's body.