1.Dear Alexander
2.mum invites the guests at 5 pm
3.I am glad that you are free on Saturday night.
4.My mum has decided to organize a tea party
5.Would you like to come to my place and meet my family?
6.Hope to see you soon.
7.Yours,
8.Vlad
Заранее на здоровье,но я не совсем уверенна,что тут правильно)