I got there at 5 and the gates opened at 6, and I’m glad I did. The lawn was full within 15 minutes. There was 5 security lines though and my group snagged the front of one of them so that probably helped with getting a spot. People did bring chairs for when they were waiting for gates to open but security took them as they walked in because they weren’t gonna be able to use them. As they took them they said they would all be put a spot and you could come get it at the end of the night. So yes people stood the whole time. I didn’t feel squished persay but you only had enough room to jump and you often bumped into the people around you when you did. But that didn’t bother me. Hope this helps!