I rarely entertain these days, but back when I did, I was ready for company at the time I said was ready for c"mpany. If a supper invitation, I usually say something like, 'come at 6:00, and we will sit down to supper at 6:30." When folks are fashionably late, I have a cold or overcooked supper to serve them.   grrrrr.

For non-supper invitations, I expected that many people will arrive late, but I made sure I was ready to receive guests at the appointed time.