Possible Clues:

• Full form of meal never freely available, it's said
• Midday party
• There's no H on uncle in the middle of the day
• Sock won't begin to be stuffed in backward Christmas - formal occasion
• Meal one finished early after mad uncle Henry entered
• Meat served at meal during the day?
• Uncle Henry has no cooked meal
• Makes a meal of finding a foreign revolutionary in London
• Makes a meal of long compound noun restricting revolutionary darling
• Formal fare produced by a French church in Spanish city