Heroes' Day is one of the holidays in Jollywood inspired by a heroic deed of Jollywood's founding fathers years ago by defeating Grim Gloom's great-great-great grandfather Gloom.

In the episode "The Jollywood Jam", The 7D put on a performance by the same name that was created and composed by Happy. As a way to make Grim feel better, Hildy gave him a wand that can do anything so he can ruin that year's Heroes' Day as a way to avenge his ancestor. Then on the way to the celebration, his wand gets switched with Happy's similar looking baton. It foiled the Glooms' plan and created a mind blowing performance that made Grumpy's lips super numb.


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