Wish you all the best!
On [date] we are planning to host a [type] fundraising event. To do this, you can attach a copy of your detailed business proposal alongside your Sponsorship Proposal Letter.
Do not write al of the content in one single paragraph. What methods did you use? Ensure that your language is polite yet confident.
This is because their Sponsorship Proposal Letters may be lacking in terms of important elements which must always be included in a perfect sponsorship request document.
We look forward to seeing you at [name of event]!