Ответ:
1.Nick said where I was going to have party.
2.Julia said that there were many holidays during year.
3.Julia said to polish the floor clean the carpets before the party Dorothy.
4.Nick said if the guest would come the next day.
5.Nick said if the guest had come the day before.
6.Niclk said when I had had a party.
7.I said if we had decided to celebrate that holiday together.