can large cameras be brought in if i have lawn seats? and how early should i get there for post malone lawn seats?

From what I was able to find on their website cameras are allowed as long as they do not have a removable lens.

No large cameras or coolers allowed. Im told there is a size limit to lawn chairs so you may want to call in advance to ask, and of course they rent out lawn chairs. I attended the Exodus Music Festival and lawn seating filled quickly.

The lawn fills up quickly. At least an hour before show time for a prime spot

Each show has different camera restrictions so check the website.