According to “The Partial View” blog, kosher food will be available tonight at the Siyum HaShas at MetLife Stadium in East Rutherford, NJ:
Stadium concessionaires will be selling snacks whose kashrus has been approved by the Agudah, including cakes, ices, soda and water. However, the sale price of snack items has been determined by the stadium not by the Siyum committee. Expect high prices. Don’t expect dinner-like products for sale.
Food can be brought into the stadium in bags no larger than 12x12x12 inches. However, Siyum attendees will only be permitted to bring one plastic, 20-ounce, sealed beverage into the stadium with them.
Click here for a report on the logistics of the Siyum and the Stadium.
Additionally, according to @SiyumHashas12, for those that have reserved suites, there will be an extensive menu of kosher options.