To celebrate Free Shake Day, Wayback Burgers will provide a free 12oz vanilla shake to customers on June 20th. The promotion is available in-restaurant at participating locations and does not require any purchase. This event is part of Wayback Burgers' annual celebrations to thank their customers. 

 Get ready for a sweet treat! On June 20th, Wayback Burgers is offering a free shake to all customers to celebrate the start of summer. This refreshing offer is the perfect way to cool down and enjoy the season. Head to your nearest Wayback Burgers and indulge in a creamy, delicious shake on the house. Don't miss out on this one-day-only celebration—mark your calendar and bring your friends!