You should bring and take any prescription medications that you are on currently. You may have to wait outside for several hours, so please dress accordingly. Bring sunscreen, bug repellent, blankets and things to help pass the time (e.g. books, cards).
You may wish to bring a lawn chair for outside; chairs are not provided. If bringing young children, be sure to bring diapers and a change of clothes to keep them comfortable. There is no onsite coat or package check, so anything you bring will need to be carried with you or returned to your car before entering the building.
Remember, you will not be allowed to leave and re-enter the building without losing your place in line. The building will be air conditioned, so if you chill easily bring a sweater or light jacket to help keep you warm.