Pink summons - park after dark.

I'm a 19 year old on summer break from college. Never had any problems with the law, record is super clean. Two weeks ago some friends and I received a pink summon for being in the park after dark. We always go to this park since it's right across the street from where we lived & there were no signs about the park closing. (The park also doesn't have a fence).
Just Yesterday another friend and I were swinging on the swings at another park and lost track of time since our phones died and got another summons for being in the park after dark. The park gate that we entered from was completely open, which I pointed out to the cops but he just ignored me. I just want to know the possible outcomes since Its my 2 one .I don't want anything on my record. Kind of scared