(1) I'm pleased to know that you're greatly interested in ... ,so I'd like to share a piece of good news that there will be a ... .Now,let me offer you some useful information.
(2) It's my great honor to invite you to enter a ... .Now,let me offer you some useful information about it.
(3) It's time for us to say goodbye to our school life soon.Surprisingly,there is a/an... prepared for us.Now,let me offer you some information about it.
1.时间&地点：The ... will be held in Classroom 302 at 3 o'clock in the afternoon on June 8th,2019.
(1)主题句：There will be various meaningful activities included in it.
(2)要点:First of all，You will be invited to .../You will be given a chance to ... .which will ...
After that,It will be more than interesting for you to .../It will impress you a lot to ... so that ...
At last,doing sth. will play an important part in ... .So ...
That's all.I firmly believe that if you join in it,you will ... .
That's all.I sincerely hope that you can come and share the happiness/fun with us.