Ah, that first outing for a new layout. Actually, it is usually an invaluable trip.
It's good that it was a low-key sort of event too - you wouldn't want its' premier exhibition to be a huge exhibition, with hoards of onlookers. This way, you can learn those invaluable lessons as to what needs "tweaking" or modifying. So you probably made a wise decision to take Garnswllt to your club event first.
I know many people feel that a simple Inglenook could get boring to operate for a whole show - but I find that time usually goes far more quickly than you'd anticipate. Chatting to exhibition goers can be enjoyable and rewarding. As you say, some swapping of stock can also help add interest and make things more interesting for operators too.
This layout is superb, and despite being a simple design, it oozes atmosphere, and demands attention and observance of details. As you say, a backscene might lend it even more a sense of "place". If it were my layout, I think I'd be tempted to place a screen in front of the fiddle - just to add a sense that the train is going "somewhere", and to hide those stock swapping moments. Perhaps I'd even be tempted not to use the ubiquitous over-bridge to conceal the exit - maybe just a couple of trees, or the end of a building?
Anyhow, that's no criticism by the way - just a thought (I do have a few, now & then! lol). Superb sir, just superb