Legal analysis: it is not illegal for training institutions not to have holidays. Because the nature of work in all walks of life is different, some employers do not have holidays, so it is enough to inform employees in advance. According to the provisions of relevant laws, if an employer arranges workers to work on statutory holidays, it shall pay the workers overtime expenses at three times the usual wages.

Legal basis: In case of any of the following circumstances in Article 44 of the Labor Law of People's Republic of China (PRC), the employer shall pay wages higher than the normal working hours of the workers according to the following standards: (1) If the workers are arranged to extend their working hours, they shall pay wages not less than 150% of the wages; (2) If workers are arranged to work on rest days but cannot be arranged for compensatory time off, they shall be paid a salary of not less than 200% of their wages; (3) If workers are arranged to work on legal holidays, they shall be paid no less than 300% of their wages.