The expression alludes to the singular and exceptional nature of Halloween. It suggests a departure from the ordinary, where societal norms are temporarily suspended, and individuals are granted a degree of freedom to indulge in activities they might otherwise refrain from. For example, its the one time when costume-wearing and trick-or-treating are not only accepted but encouraged, regardless of age.
The significance of this sentiment lies in its recognition of the human need for occasional escapism and communal revelry. Throughout history, cultures have designated specific periods for festivals and carnivals, allowing for a release of pent-up emotions and a reinforcement of social bonds. Halloween, in this context, provides a sanctioned outlet for playful subversion and imaginative expression.