See if a local restaurant will donate a portion of their profits on a weekday (lunch & dinner) on a particular day. The point being, that you get people to go there on that day.
A great social fund-raiser was a potluck & "basket" auction. Each family from the team puts together a "basket" to auction off in a silent auction. The families who have season tix to a pro team donate a basket with the tix and maybe a T-shirt from that team. Go to a car wash and buy a couple of car wash coupons and put them in a bucket with a sponge and car wax. Put together a hot cocoa basket with mugs and a variety of packaged hot cocoas mixes.....etc. Yeah, it was the same families doing the donating & buying, but it had a two-fold purpose: bonding and raising funds. Our HS soccer coach also ran summer clinics for younger players, using a few of his HS players to help him, charging the kids. He paid the older players a little something and had some other costs, but he donated what was left to the team.