The key to a successful event often hinges on the quality and flavor of the food and beverages served. Indeed, whether you're planning a corporate gala, a wedding, or a simple family gathering, the selection of an apt catering service is critical. This compelling task intertwines the concepts of economics, logistics, and social science, requiring strategic decision-making and careful planning.

First, let's delve into the 'why' of the situation. The importance of hiring an ideal catering service is multifaceted. Not only does it ensure your guests enjoy a memorable gastronomic experience, but it also significantly influences the overall ambiance and success of your event. The reality is, the service, food quality, and presentation delivered by the caterer will subconsciously impact your guests' perceptions of the event's success.

Let's explore the 'what' of the situation. Catering services are not one-size-fits-all; instead, they range from full-service caterers who handle every detail from menu planning to clean-up, to niche caterers specializing in specific cuisines or dietary needs. Understanding these differences is crucial in defining what you require for your event.

Now, when it comes to the 'how', we have to consider a multitude of factors. The choice of caterer should ideally align with your event's thematic elements, be it the decor, the venue, or the purpose of the gathering itself. This alignment requires the application of the principles of harmony and coherence, often used in visual arts and music, but equally applicable here.

Moreover, this is where the concept of the Pareto principle, or the 80/20 rule, becomes relevant. It states that 80% of outcomes result from 20% of all causes for any given event. Applied to our scenario, it implies that focusing on key elements such as the caterer's reputation, their ability to meet your specific needs, and your budget constraints can ensure a successful outcome.

In terms of 'where', this refers to the selection of a local catering service versus a more distant one. Here, the trade-offs become evident. Hiring a local caterer may provide benefits such as in-depth knowledge of local tastes and dietary preferences, easy accessibility, and potential cost savings due to reduced transportation costs. However, if your event requires a specific cuisine or a renowned caterer from outside your locality, the added costs and logistical challenges might be justified.

The 'when' pertains to the timing of hiring a caterer. The principle of supply and demand, rooted in economics, applies here. Catering services are in high demand during peak seasons like holidays or wedding season, meaning booking early is critical to securing your preferred caterer.

Lastly, 'who' refers to the selection of the caterer. A strategic decision model, similar to that used in business scenarios, could be applicable. Firstly, identify your needs and preferences. Secondly, gather information about available caterers. Thirdly, evaluate the options against your requirements. Fourthly, make your decision, and finally, implement it by hiring the caterer.

The task of hiring a perfect catering service for your event, despite its apparent simplicity, is actually a complex process that requires careful thought and strategic planning. It requires an understanding of various principles from economics, social science, and even artistic elements. The results, however, are undoubtedly rewarding. By choosing the right caterer, you not only ensure a delightful culinary experience for your guests but also contribute significantly to the overall success and memorable nature of your event.