Possible Clues:

• Hill's Holy Week prayers
• Number joining bishop in time to join eastern ritual before Easter
• Holy Week candle-snuffing service
• Christian services held during the three days preceding Easter
• Holy Week service
• Service with candles
• Organ to remain clear when setting up religious service
• Church services perhaps, for Jedi hunters of the Dark Brotherhood
• Candle-extinguishing service
• Office a number erected originally on Scottish hillside