I am about to get summoned for The Hurt Locker so will jot down ideas before waiting for answers from you Beebs, I know this may not exactly suit! Not sure do you want internet fans or actual bods in shop. You can adapt any of these you like, I suppose. Errrm
12 Days of Christmas - Christmas card competition - can use any of the 12 days themes - partridge, drummers, etc. Pick 12 winners and if they send you the cards you will sell them? Or just have a one-wall exhibition of them?
Christmas Cakes - suggestions for alternative Christmas cakes, including cupcake-sized cakes. They don't have to do recipes, just give the idea.
Suggestions for Christmas music for you to play in the shop? (The Temptations!) And you send the winner the CD they have chosen?
Advent, you could have one a week for the four weeks of Advent (is it ok to mix religion with cake? check with ALBS)
I am longing for you to have a competition called Tempt Fate but I'm not sure what it's about.
Temptingest Tea Party? People have to come up with a fantasy tea party, ie nominate six guests, what they would eat & drink, and then you shortlist entries and the public / FB fans etc have to vote for the one they would most like to attend? The winner gets a box of brownies to kick off a real tea party, or a tenner voucher for goodies. Voucher good because drags people in. OR if there is a day the shop is closed the winner could have a tea party with friends IN the shop & you would pour tea and provide cakes (you will knee me in the groin for suggesting that. perhaps not practical
nor enjoyable).
You could do the thing they do in the Beano or whatever, people have to post a photo of themselves eating cake at the Taj Mahal, or on a camel ride or at the top of the Empire State Building?
Food photography comp?
Errmmm
Need a better brief