Let the venue detail carry the frame.
One row of seats, one glowing sign, or one printed ticket edge can hold enough atmosphere without turning the page into a performance guide.
Keep it object-led.
Porchvello works best when the subject is a surface or structure: seat rows, curtain folds, lobby light, paper, rails, numbers, and shadow.
Stay away from advice.
The site should not tell readers where to sit, what to buy, how to enter, or what venue rules mean. It only studies the look of theater spaces.