If you would like to acknowledge receipt of the money for an event sponsorship, here is a simple template you can use to write an acknowledgement letter for an event sponsorship.
We, the sponsorship team at [event name], would like to acknowledge your sponsorship for our event. We have received a total of [amount] to assist us in the organization of the event. This sponsorship enables you to be one of our [gold/silver/prime] sponsors. You will receive several benefits and perks with this title.
We thank you for your endless support and for trusting us in our venture!