First time as an assosciate sponsor. Need suggestions.

I want my bakery/brand to go viral on social media and even during the day in the upcoming fest, which is going to be my first as a sponsor, at a college this month end. For example: I plan to give coupons like BOGO to the students or free item on a bill above X amount or a good value gift voucher for store visit etc. Anyone has some catch worthy ideas to attract the crowd?