Shoreham Airshow

I was planning on making the trip to the Shoreham Airshow this weekend, but I’m wondering if I didn’t miss my chance for admission. The website says they are available on the day. Does that mean I can buy a ticket at the gate or do I have to find some place that sells them? I’ve never been there so I have no idea what the layout is like, what the crowd will be, where to park, etc.

My plan is to get up quite early and get there early to give myself a fighting chance of getting. Any thoughts or tips?