A food competition featuring local restaurants who donate their food for the chance to win a trophies (and bragging rights) - Think of a common food that each might have. some examples
Find a place to hold it, and date.
Limit it to only one food item and determine a small size for the public to sample.
Publicize with flyers and any kind of free advertising you can get from radio stations, newspapers, etc
Have a way for public to vote for their favorate
Public pays at the door for admission
Of course there is more to planing this kind of event but we find it to be low cost high return