[Swizec]

> But it’s far more better to time everything just right so that one arrives at said meeting right on time,

This is really really not true for parties. The polite thing to do for a party, as long as it is not a dinner party, is to be at least 1 hour late. Nobody expects guests earlier than that. It’s the unspoken rule.

For dinner parties the usual 15 minutes late is on time.

[yorak]

Ah, perhaps in the other corners of the world, but in Finland we do not play such "games". That is, if you invite someone over by 17 pm, it might mean by 18 pm, or might not. Here, if you invite someone at 17 pm, whatever the cause, that is the target one should be aiming for. Some think of our culture as too direct or blunt, but in my mind ambiguity and misunderstandings are a root cause of much misery. :)