DC Games Concert Seating?

So I got tickets for this year but am so confused about how seating works..and ys I CALLED the stadium but no one there could tell me how it was going to be done...other event staff are handling it.

but the tickets are kinds of crazy...none of the rows/seats are anywhere near each other and the guy at the ticket window said it didn't matter...the tickets were just for general admission. There were supposed to be field or seats as choices so you would free for all I guess based on who gets int he gate first??? but anyhow - my tickets says lawn. So I don't know if this means we have to be in the side lawn berm type area...or if lawn means we can also go for the field seats? The staff didn't know...but curious about someone's experience with last year?

I really wish it was just assigned seats...I hate chaos and with all the kids that will be there it will surely be nothing but chaos...the line starts forming 3 hours before the doors opens - I know that...now that is just nuts!