The line will definitely be picking up by then.
All signs I've seen point to a record crowd this year, so I would try and plan accordingly.
You can bring food out, but I think coolers are a no-go. Too many folks try to bring out alcohol and they'll probably turn you away walking up with a cooler and tell you to put it back in the car. I've brought sandwiches before no problem.
There's also food and soda available for cash purchase on site.