Ghirardelli, the iconic confectioner, is helping to maximize the holiday spirit this season, and kicked off the merrymaking on National Peppermint Bark Day with a one-of-a-kind caroling experience to welcome the return of its beloved seasonal offering. This year marks the 20th anniversary of Ghirardelli Peppermint Bark, the limited-time fan favorite.

To celebrate, Ghirardelli delivered an oversized, wrapped gift box outside the Shops at the Oculus to let passersby know that once holiday cheer reached an ultimate peak, something special would occur. One by one, a guitarist, a violinist, carolers and a brass band began singing “Deck the Halls,” inviting hundreds of strangers to join in the singing to raise the holiday spirit, and thus, the holiday meter. Once the holiday meter reached its peak, the mystery box opened to reveal more than 30,000 squares of free Ghirardelli Peppermint Bark.

For merrymakers not able to experience the mystery box in person, Ghirardelli is rewarding fans who help spread holiday cheer by sharing the video of the big reveal on Instagram using #PeppermintBarkSeason. December 4–10, people who share the post will receive a 10% discount code to use on Ghirardelli.com and will automatically be entered into a randomized raffle for a chance to win a custom Peppermint Bark–inspired box of goodies.