I haven't been there in a couple years, but used to visit once or twice a month.

I remember a very diverse crowd of blues fans. Bring your own chair and a few bucks for when they pass the bucket. Mellow vibe, good time. There was a Porta John. Some folks bring their own small grills, like a hibachis. Some folks will sell you stuff from their own grill. Pop/water/ice cream were available. Parking can get tight. Lots of cool cars and bikes.

It isn't all old folks. I saw kids and grandkids during most of my visits. Everybody was on their best behavior. I never found anything other than friendly blues fans.