It's been a few years myself that I've been to a sky show, and was able to go to the one with this group earlier this year so I can give my impressions (VERY positive)
We will be camping in the field (if you are camping, some people come by just for the night time viewing)
so if you are camping, just all the normals of camping, bring breakfast, lunch/dinner with your stove or ambient temperature or a small cooler if you?are familiar with that.
The sky viewing starts around sunset, so either a chair, or nice picnic blanket for watching yourself, and there are telescopes around that people share, aiming them at deep sky objects. (Galaxies, clusters of stars, blown up stars, planets)? Saturn will be visible, with it's attendant moons, and Neptune and Uranus a little later in the evening.? Earlier this year we lucked into a lunar occultation (stars getting blocked by the moving Moon), and even saw a SpaceX launch?to main engine shutoff.
I haven't seen food trucks at this site, don't think any are planned so bring food and snacks to leave in car.
Have hat, coat, gloves, warm layers, it will get cool overnight.? I always put on long sleeve shirt, long pants, boots to keep warm, to extend how long I can look for things in the sky.
If you happen to have a planesphere, bring that, to get oriented to the sky.? I'll bring a laser to point out constellations and things.? If you have binoculars bring that. I made a device to help people new to binoculars, be able to follow the green-line to center interesting things so we can all see them together.
Here is a link for the forecast cloud cover:
and here is a link for satellite passes (will get more accurate as we get closer to the weekend)