If you are British you would...(несколько ответов)
-say "Many happy returns of the day" to your friend on New Year's day.
-put your knife and fork across the right side of the plate,
-cross your knife and frok on the plate when you've finished eating.
-drop into your friend's house if your are near.
-say "Many happy returns of the day" at your friend's birthday.
-call your friend before you come to their house.