Because the catering industry belongs to the service industry,

The service industry is busiest on holidays and Saturdays and Sundays.

Generally, there are relatively many people who look after the catering industry on Saturdays and Sundays, so in many cases, employees in the catering industry are not allowed to take a holiday on Saturdays and Sundays, and they can take a break at ordinary times, which is the characteristic of the service industry. I hope my answer can help you.