Possible Clues:

• Self-indulgent session
• A heavy drinking session
• Being tipsy as a result of this?
• Being organised for a bout of over-indulgence
• There does be gin in it
• Heavy drinking in W German tourist town mostly
• Go on a jag
• As for Crosby, 'e had more than a drink or two (5)
• Game not finished by quarter during bout of overindulgence
• Brief indulgence