Dear xxx,
How time flies! It is time for us to say "Good-bye" to each other.
The time we spend together is worth to remember forever.
So,in honour of our friendship we are going to organise a party before we leave our school,which will begin at 6:00 p.m on this Sunday at the XXXrestaurant.
We hope you can join us!
From,XX
亲爱的XXX：
时光飞逝,又到了我们告别彼此的时候了.我们在一起的日子值得被永远铭记.所以,我们在毕业前举办了一个聚会,以此来纪念我们的友谊.聚会将在XX酒店于本周日下午六点开始.
希望你能来参加.
XX