Email about invitation for taking part in picnic

Imagine, you are Mamun. Your friend is Sabbir at Dhap, Rangpur. You are going to have a picnic at Mahasthangarh. Now, send an email to your friend inviting him to take part in the picnic.

I have not received any email from you for a long time. I hope you are fine. You will be happy to know that we have decided to have a picnic on the 20th instant. Our Principal has advised us to hold the occasion at Mahasthangarh, Bogra. You know that Mahasthangarh is a place of historical interest. It is also a nice place for a picnic. Shameem, Abir and Nannu will also attend the picnic.

So, We expert to have a very pleasant time there. I invite you to join the occasion. I hope, you will come at our residence on the 19th instant positively.

Please do come. Convey my regards to your parents.