Catch client's eye: Draw the consideration of the client by showing enhancement. This separates your store from stores that don't show any merry themes.
Increase brand mindfulness: Festival enrichment expands the happy mind-set of the client. They are bound to recall your store in a way that is better than some other store.
More deals: Customers in merry state of mind are bound to purchase. Your store expanding the merry state of mind implies more for additional deals.