At a quick glance, some cost items appear to be missing:
Buffet/display rentals, e.g. bowls, platters, etc.
Consumables/disposables: plates, tableware, glasses, napkins, table coverings
Beverages, e.g. coffee, tea, etc.
Bar and adult beverages
Overhead allowance for insurance, license(s), etc.
Otherwise, you appear to be on the correct path.