Write a letter to your friend inviting him to join a picnic.
Dear Hasan,
I hope you're doing great! I have some exciting news to share with you. There's going to be a picnic, and I really hope you can join us. It's happening next Monday, and we're a group of ten friends, counting you. We've decided to have our picnic at Gazipur National Park. We'll be taking a bus to get there. Oh, and don't forget to bring your camera along – we're planning to capture some great moments.
I really think this picnic will be a lot of fun, and it would be awesome if you could be a part of it. On behalf of all of us, I want to personally invite you to come on the designated day.
Looking forward to spending a great day together!
Warm regards,
Sagor