If you are writing the letter you first must include your full address and the address of the person that you are sending this letter. Also, do not forget to add the date of writing to your letter.
For example:
Dear cafe Rose,
I want to ask you if you are willing to organize a quiz contest in your bar. It is a good opportunity for the people from our city and other cities to participate in charity and in that way we can save money for the people that are needing it in our town and also we will have so much fun doing quizes and many people are willing to come and enjoy.
