Introductions and greetings can be tricky. For example, during first meetings should you shake hands, kiss on cheeks and if so, which cheek or both? What about bowing? Who is supposed to speak first, the hostess or the guest?
It's always good to know a little something about the local cuisine and utensils. You should be aware if the local cuisine consists primarily of a food that you may be allergic to or even like so you can plan ahead. Alcohol, no matter what country you're in, should be consumed in moderation at any social function.
Remember that grace and humility go a long way whenever visiting a foreign country. By preparing ahead of time, you might make your stay go a little a smoother and perhaps avoid some unpleasant surprises.