if there is a class field trip with other schools coming is it just for the students or also for the people that want to visit?

It will usually be open to the whole public still

Ask your school

Check the main website and click on park hours. Find the day of your event. If that day didn't have park hours on it, it's just for schools. If they post hours on it your sharing the park with the public. 😀

Its open for the public. Although, there are certain days reserved for grad night and things of that nature. Good luck.