If you say your party starts at 20h00, there are people that will start preparing themselves at 20h00, which mean they will arrive after 21h00
I think it is stupid to come exactly on point. Especially for parties, I'd never come within the first hour. Except of course, I'd help organising it.
One thing I liked about that thread was talking about just "dropping by" at friends'. I think this is also a matter of age here. I do that often at my friends, and counterwise. But when people get older and have an own family and stuff they tend to stop doing that and only visit themselves by schedules. At least this is my observation, although I know some exceptions, hähähä.
I also think eating while going is stupid. I must say nearly everybody does it, but I hate it. When you do something you should concentrate on it. So eat, and when you're int he city or somewhere away from home, search for a nice place, sit down and eat. But don't run through the city doing 3456346 things at the same time (with the cellphone in the other hand, hähähä).
About appointments: It is like that for me. When I'm about to meet with just one person, I'll come (mostly) on time, because it sucks for someone waiting alone. But when I meet with more friends I hate coming exactly on time, I think that's stiff.
Well not exactly "hate", but what I want to say is, that there is no sense in hurrying. You just know you'll meet them and go relaxed.
I've only read this thread upto page 4, I don't know if you've talked about red lights crossing. That was actually why I found this thread, I wanted to talk about that.
Would you cross a street at red lights? (on foot)
I cross small streets when there is no car near and no, or only grown up persons around. (Although I had to doubt if it wouldn't be better just to cross the street if it would be very small and no cars at all in sight, but an children near.)
But I wouldn't cross main streets in the city, even when the street is currently empty, because there are always people already waiting, and crossing before them would be very rude, and there are always kids.