The unofficial policy here in SeaTown is that when we host a National, our Umpire's Association provides hospitality (meals, water and snacks) for the umpires throughout the tournament, as well as the umpire dinner on the last night of the tournament.
As the umpire coordinator for the 18A Western last year, that task fell on me. We spent around $1200 for the entire week, and that included the banquet. Those there can attest that my girlfriend made a darn good clam and shrimp boil - tailgate style, along with all kinds of salads and snacks, and chicken and hamburgers right off the grill. (Being a catering director, she has some "in's" for this kind of thing.)