Possible Clues:

• How often do you see a lord embraced by two unknowns?
• Get the Wye too soon for the annual
• Like the return of swallows to Capistrano
• Annual say finally produced before deadline?
• Approximately every 52 weeks
• Annual holiday ends too soon
• Happening once every twelve months
• Every tenth of a decade
• Yen to get ahead of time when Christmas comes round
• Annual holiday ending too soon