我就翻译一下楼上的吧.顺便加上我的额
when you are brought to a forigener"s birthday party,what you should do first is to arrive in time.Usually,you need to bring a gift like some flowers or a bottle of wine,that helps you show your appreciate and make him or her feels you are happy to be here.
while you are enjoying the party,be polite but not nerves.
As for the zuit ,it depends on how big the party is.if your friend told you it just a tiny party like family meeting,you wear unformal suits like T-shirts.if it is formal ,you should put on shirt and tie.
