SPONSORSHIP LETTER FOR EVENT

I need a sample sponsorship letter/Donations for my Marketing class.

The sponsors am seeking are:

liquor vinyards,Restaurants,Halls,Caterering Companies,D,js and Decorators.

I need to ask them could they sponsor my event,

My comapany is called V.O.W

We help abuse woman,I would like to have their services free for a book signing event and some proceeds will go to a Domestic violence center for woman and kids,Could someone do a sample letter in a couple of hours half a page .