At your small and big tournaments there are always some special prices to get, like "Nearest to the PIN", "Longest Drive", "6-iest Woman" or "Nearest to the cigar".
These tournaments will seem even more attractive when they're realistically displayed on a big banner or even a small flyer at the beginning or in the invitiation att he restaurant. With this kind of display everyone who is donating a price will see a real use for it.