Companies that have grown enough to have employees have a fairly standard set of needs. If they create a product, they must have raw materials. Not all large companies sell products. Some of them provide services. In any case, manufacturers and service companies must both have employees. Without them, the work will not get done. If there are no products or services, the company will go out of business. Manufacturing companies also have to move their product. Unless it can get to consumers, there will be no reason to manufacture products.
What all of these companies have in common is the need to hire workers. Service companies do not often have the need to buy large quantities of raw materials and ship product, but they still have supply and shipping needs. Business exhibitions for large companies are very helpful. Depending on the type of exhibition show, a company can find workers, suppliers or even logistics specialists.