GA means General Admission and SRO means Standing Room Only. These terms are used for sections and rows that do not have assigned seats and where you sit or stand is on a first come first serve basis. 

If you purchase tickets such as “Pit GA”, you are required to stand the entire event and may be fairly close to the other people in your section. If you have “Lawn GA” tickets, there is often room to sit on the ground if you view the show from further away from the stage.

Even though these sections do not have assigned seating, tickets may have numbers or letters in the sections and rows. This is so the venue can keep track of inventory and does not affect where you can sit or stand.