Another Great Promotion is The Birthday Promotion:
You Advertise on Facebook to people within about 20Km of your restaurant. People who have a birthday coming up in 7-10 days:
“FREE Dinner on your Birthday 


If you have a birthday this week, you’re eating for free at {Your Restaurant Name}!
Get your FREE voucher to eat for free at our place
If you have a friend who has a birthday this week, mention them below!”
It doesn’t have to be a free dinner, it could be a cake, drink or 3 course meal.
This will attract more customers than the birthday person, as they will bring their family and friends.
Make sure to grab everybody’s email address for future promotions when they arrive. (Incentivise them to give their their email address with the promise of a Free Offering the next time they book, for example, starter, drink, dessert, buy one get one free)