Dear Mr. /Mrs. [mention the last name of the recipient with appropriate salutation before it],
First paragraph: Mention the reason for writing that is the event for which you want to raise fund and also inform the recipient that you want him to contribute to the fund required.
Second paragraph: In the second paragraph mention the reason for conducting the event. If the event is going to benefit anyone you can also mention that how the event will benefit them and the event is particularly dedicated to them.
Third paragraph: In this paragraph mention that you are expecting a positive response from the recipient and he should contribute to the fund raising process as it will benefit him.
Name of the sender
Designation of the sender
Organization in which the sender is working
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