Possible Clues:

• French beard and pigtail, say, put on for the party
• Hot dogs, ribs, steak, etc.
• Be prompt after pub meal
• Outdoor eating occasion
• Do out pub and be prompt!
• Hairdresser cut down sign to start outdoor catering
• Pub worker, say, stopped by copper for a grilling?
• Outdoor party (full of sizzle?)
• Open-air party with roast meats etc
• It's cooked outside