Offer Free Services to a Charity To Advertise Your Business. Thank about this. Your favorite charity has a big annual event coming up, and while you would be happy to contribute a monitory donation, why don’t take it to the next level and give them something that would make their event more successful. While at the same time you get free exposure to many generous people and a tax write off. All kinds of ideas would work depending on the type of event. Free samples, treats, goody-bags, coupons, entertainment, games etc…