That's easy...return on investment. And these strategies guarantee the best return, because they cost next to nothing to get rolling.
Competition brings out the best in people...so create a competition between your employees. The biggest influencer gets a day off.
Make sure people in your restaurant have a chance to tell you who they are. There are several ways to make it easy for people to get into your lead CRM...QR codes, short code SMS, landing page URLs. Give them an offer to incentivize them in.
Motivating first time buyers to your restaurant can be tricky. The bigger the promotion, the better the response. Create a great name and great product for yourself, and good promotion will create more buzz in the community then a three-legged horse winning the Kentucky Derby.
Might seem silly, but give people a reason to not only come, but to celebrate. We've had our clients put up a screen and create a drive-in movie theater in his parking lot. Using his mobile app, they could order food and drinks from the car.