A bigger issue is also , Met Life Stadium is BIG. It holds over 82,000 for Football, Probably more for the Siyum depending how they set the stage up.
The Parking lot is Huge.
If you are sitting in the upper deck, It has taken me over 20 mins to get from the entrance to the Upper Deck.
If you are going as a mixed family sitting seperate and rejoing after the Siyum you are asking for trouble. Unless you really know the stadium which most who are going dont. There will be lots of lost people especially children.
If you are going to go with family members you might want to consider going seperate as well and meet up at home and avoid parking, Take the Bus or Train