I would like to know the work regulations for hostesses, promoters, and stewards.

Labor regulations provide for various possibilities for classifying employees, based on the characteristics and duration of the work to be performed.
For example, to work as a steward in stadiums or as a sales assistant in a shop, it is necessary to use an employment contract (e.g., fixed-term or intermittent), while for other jobs where the task can be performed completely independently (e.g., translation/interpreting or stand management and promotions), a self-employment contract (occasional or otherwise) may be used.
In other cases, such as waiters, where there is no autonomy in the performance of the services, an occasional subordinate contract must be used, with payment by vouchers.

Therefore, there is no single type of classification, but it will be necessary to assess the correct classification to be adopted for each individual event.
Below is an article taken from FISCOMANIA: This means that working as a hostess or promoter effectively means being self-employed. From a tax perspective, it is necessary to distinguish between those who carry out professional activities on a self-employed basis on a regular and continuous basis and those who only carry out such activities on an “occasional” basis. This distinction is fundamental, as we will see below, for the correct application of tax legislation.

Hostesses and promoters: occasional work
Hostess and promoter work is usually carried out through communication agencies, which pay the young people who offer their services for this work directly. The various agencies tend to use the formula of so-called “occasional services” to regulate the payment of hostess and promoter activities carried out by young people. This methodology is linked to the fact that the activity carried out is purely “occasional,” otherwise it could not be used.
The only regulation that governs occasional activities from a civil law perspective is that referred to in Article 2222 of the Civil Code (concerning the contract for services).

Occasional nature of the service
A worker who performs an occasional service can be defined as someone who undertakes to perform, in return for payment, a task or service mainly using their own labor, without being subject to subordination or coordination by the client, and on an entirely occasional basis. When hostess or promoter activities are carried out on a non-continuous basis, it is possible to use the Occasional Service to regulate the compensation between the agency and the hostess.
The occasional service is a tax regulation aimed at regulating activities that are not carried out on a continuous basis, i.e., occasional activities. To determine when an activity is occasional, reference must be made to how many times the activity was carried out during the year.
If the activity was carried out once or twice a year, the Occasional Service can be applied, but if, for example, the activity was carried out for several days during the year (either for a single agency or for different agencies), it is necessary to operate professionally with a VAT number.
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For more information, visit the FISCOMANIA page — HERE