Attending a Dinner Party
If you have been invited to a dinner party make sure you RSVP promptly (mentioning any dietary requirements you may have). If you can't make it you'll be giving the host plenty of time to find someone else. If you have to cancel, give as much notice as possible.
Never arrive early to a dinner party. A few minutes after the time stated on the invitation is polite; if you are going to be more than 15 minutes late phone ahead and warn your host.
It is polite to take a gift; chocolates, flowers, or a bottle of wine are all good choices. Take a couple of bottles if there are two of you. Always write a thank you note as soon as possible after the event; phone call is also fine for casual evenings. A reciprocal invitation should follow where appropriate.