Here's a suggestion for 2018.

Have people preorder the merchandise they want to get and submit it to SE so they can compile a rough estimate of how much merchandise to bring. People will be able to pick up their items at a predesignated time so no one is wasting hours upon hours of precious time in line. SE would just need to include additional inventory of what\\'s been preordered to take on any last minute purchases.

For those who do not preorder, they can still wait in a separate line for any last minute items they now want.