my mom would make sure she was able to 'survive' taking us kids to the assembly with a wide variety of 'quiet' snacks, gummy bears, jelly beans, mints, gum, cheerios, placed in quiet containers, tucked in quiet book bags or her giant quiet purse. then we have the assortment of books, tablets, coloring pencils, blanket ,pillow, THEN, to make sure we behaved, she carried a quiet wooden spoon in her purse, which my brother was smacked with in the ladies rest room, quite a bit.
after all, those snacks and coloring pencils always assist a child in siting still.... lol