Possible Clues:

• Seat about six inside trailer
• Screening before release for the general public
• Advance screening of power survey
• Film trailer, e.g.
• Cleric one in seat for special showing
• Trailer parking right alongside edge of rifle range
• Vicar: 'One must sit in seat in church and look ahead'
• Papa about to struggle with Western, cinematic event?
• Early opportunity to see clergyman I located sitting in church?
• In advance, see vicar, one occupying bench