It is not illegal for insurance companies to hold travel fairs. Whether it is illegal or not depends on local laws and regulations. In some areas, insurance companies can publicize and sell travel insurance products by organizing or participating in tourism fairs and other activities, which is a relatively common behavior.
However, it should be noted that insurance companies need to abide by relevant laws, regulations and industry regulations when promoting and selling travel insurance products, such as not making false propaganda, deceiving consumers, selling beyond the scope, etc. To protect the rights and interests of consumers and maintain market order.