answer:This is a toughie. To answer this question, we’d have to narrow down: - what TV stations were broadcasting in 1973 – what their schedules were for those nights – the cast and crew for each show on those schedules I suspect this is going to be impossible to figure out as stated. I’m going to guess you don’t want to ask your mom for more details, but I think you’ll have to. You will probably have better luck if you know more about the actual show – if it was a TV series, you have a better shot. If it was a film, that will be harder. Was it a comedy or drama? Can she remember any of the actors at all? Was it a Canadian production? Those would be good clues to start with.