There are die hard Sox fans who wouldn't miss a game. But if there is some other event going on that rarely happens, say a supermoon or whatever other rare events, some fans might miss part of the game for it.
I'm not asking to do therapy on the weekend as a freestanding time. Nothing is absolute, right? There should be exceptions. What about the therapist's coworker who talked with me on the phone Sunday evening because I had something going on? That's being flexible. I understand professional and personal boundary. But nothing should be absolute or rigid. There should be room for exceptions.