1) If you go to a birthday party, you should dress up according to the dress code of the event.2) You should call to you friend and ask about clothes.3) You don't have to wear something ridiculous.4) You have to buy a gift to your friend.5) You shouldn't buy an expensive gift, it can be simple but nice.6) If you are a creative person, you can make a handmade gift.7) Before you give the gift to a person, you must say a few nice words.8) You shouldn't start to eat until all the guests didn't come.9) You must behave politely and decently at the table.10) If someone ask you to help with salad or to give some plate of food, you should do this.11) You must keep the conversation at the table, don't be silent.12) When cake is served, you mustn't blow out the candles first.13) You can leave early, but you have to say goodbye to all guests.14) Before you leave, you should help with the cleaning.15) If it is late evening and party is over - you also have to go.