On nude events I don't really know how to have a shirt pocket, but anyway ...
Get a cover for your phone with to hang it to your neck, or use above pocket trick. Install this app, it records ib background with display off. It can also use the selfie camera so people will see your phone is off 😁
This app has
NO internet permissions, so it can't send your pics elsewhere (other apps might do this).
https://play.google.com/store/apps/d...myzel394.alibi