Wayback Burgers will give away chocolate milkshakes. Here’s how to get one.

Wayback Burgers will give away chocolate milkshakes on Monday, June 21.

And, if you are one of the first 50 guests you also will receive a “Shake Koozie” to keep your milkshake cold.

No purchase is necessary. The 12-ounce milkshakes are made with hand-dipped Blue Bunny ice cream and milk.

“We at Wayback Burgers cannot think of a better way to kick off summer than the indulgence of one of our hand-crafted milkshakes. Offering our chocolate shake for free is a perfect nod to the nostalgia that both summer and the Wayback brand brings to our guests,” said Patrick Conlin, president of Wayback Burgers. “We hope to have many folks take advantage of this fun offer.”