Another point - if you invite me over for dinner, I'm going to be surprised and slightly offended if the TV is on, unless the invitation was 'come over, I'll make dinner and we'll watch Whatever'. With family I might leave the TV on but only if it's close enough family for people to be wandering about, looking after themselves, or I might leave it on for the children, but adults? No. I can watch TV in my own house, thanks, and if that's all that's happening, and you aren't actually going to interact with me, why am I here?
Put me in the (UK) camp of a dinner invitation of 7 for 7:30 meaning I arrive between 7 and half past, we go to the table at about 7:30, give or take, eat, sit around with coffee and a glass of wine, take the rest of the wine into the conservatory, I'll expect to leave at about ten.