....put them in the team name so if/when they show up they hear their company get called out.....that is assuming you don't have a billion sponsors in that name *looks around for 343*
Definitely put it on your website. ask them if they have any handouts they want to give away at the competition (ex. Busch Gardens/Sea World gives us coupons from their theme parks to hand out at events, they are few, but they go fast.)
Have a team trailer or something? sticker it up *still looking around for 343*
i dunno.....i think that is all the tricks I have learned off of Metal-in-Motion....maybe more to come, but I'll have to think real hard.
[edit]at the end of the year get a trophy/plaque/framed letter signed by everyone/gift and give it to them thanking them make sure they know they were apreciated so they will come around again the following year.[/edit]