Question

write a letter to your friend inviting him to attendn your younger sister's marriage ceremony

Answer 1

I am pleased to inform you that my sister’s marriage has been fixed and the marriage ceremony is scheduled to take place on 24th December This is an advance information to you. A formal invitation card is being sent to you separately.
I would request you to please attend the marriage ceremony..
say hello to aunt n uncle

with regards
your lovely friend

Answer 2

Amalapuram,
23-12-2017.
Dear friend,
How are you ¿ I am fine here. I hope the same with you.
I am writing this letter mainly to invite you to my young sister marriage ceremony.
Say the greetings to your parents.
Yours lovingly,
Xxxxxxxx.