Is there any air conditioning close to the stage or anywhere at all?

The venue is outside. Some of the arena has covering for rain but lawn seats do not.

No there isn't whicj mewms you need to drink plenty of fluids or buy plenty of them

I didn't even look. It was cool the night we were there. We needed jackets! 🙂 And we were in the lawn.

Its an open air venue. No

I didn't encounter any. we had lawn tickets.