Answer:
25 May, 2015
Dear Sami,
Today I am writing to you with a gay mood. You will be glad to know that we are going to arrange a picnic on the 15th instant. All of my friends have cordially invited you to join us. This year we have selected 'Gajni', Sherpur as our picnic spot. Two of our friends have already visited the place. They reported it to be an excellent place.
As you are very close to all of my friends here, I hope you will enjoy the day. Your joining will also give an extra dimension to my pleasure. So, please come to my residence at least one day before the date fixed. No more today. More when we meet.
Your ever,
Sujon