In some businesses, a specific season can be frequently associated with much higher sales than usual. This is particularly true for the end-of-year season in the case of consumer oriented businesses.
The period is then frequently associated with (sometimes much) lower than usual sales. Examples that come to mind include toy vendors after Xmas, pumpkin dealers after Halloween, and so forth.
Question: Are there any strategies and tactics that a business which experiences this kind of seasonal sales pattern can execute to prevent sales from plunging too much?