Possible Clues:

• Three-hundredth anniversary
• Middle Eastern hesitation every 100 years leads to long celebration
• Anniversary bash outside eastern entrance out of control
• 300th anniversary
• Terence goes round canteen drunk for anniversary
• Sad about recent changes over new commemoration of time past
• Celebration of ten-year trance without a change
• Celebration of Johnson's article in recent 'Network Rail'
• Fabric draped round renovated canteen in celebration of historic event
• Our observance now of Queen Anne''s succession, for example