Final answer:
The promotion of baseball-nut ice cream during a baseball season is known as seasonal promotion, which exploits the relevance and popularity of products during specific periods.
Step-by-step explanation:
The promotion of baseball-nut ice cream during a baseball season would be classified as seasonal promotion. Seasonal promotion is a marketing strategy where businesses capitalize on particular periods of the year when specific products or services are more sought after or relevant. For instance, promoting baseball-themed ice cream during the baseball season aligns with increased fan engagement and favors higher sales volumes due to the popularity of the sport during that time. In this case, the baseball season is the specific time/event, and the baseball-nut ice cream is the product being promoted.