Simply replace the unfilled areas such as "__" and "_[date]_" with your information.
My name is [Name] and I am [the/a] [title] of [organization]. Our [organization type] is holding a [type of charity or fundraiser] supporting [beneficiary]. This is an important cause supporting [reason for event]. It will help [more details about how beneficiary is helped by event or money].
I am writing to ask you to support our [event type] through a charitable donation. As a leader in this community, it is important to us that we have your full support. This is your chance to demonstrate your commitment to our community. Your gesture would be greatly appreciated.
Please call me if I you have any questions.