1. Whether it is illegal for a university not to have a holiday on May Day needs to be decided according to the specific circumstances:

(1) Students are not laborers and are not regulated by the Labor Law of People's Republic of China (PRC), which is not illegal.

(2) It is illegal for teachers to go to work normally during May Day, and the school does not pay overtime wages.

2. Legal basis: Article 40 of People's Republic of China (PRC) Labor Law.

During the following festivals, the employer shall arrange employees' vacations according to law:

(1) New Year's Day;

(2) Spring Festival;

(3) International Labor Day;

(4) National Day;

(five) other holidays as prescribed by laws and regulations.

Article 44

Under any of the following circumstances, the employing unit shall pay the wages higher than the wages of workers during normal working hours according to the following standards:

(1) If the laborer is arranged to work longer hours, he shall be paid no less than 150% of the salary;

(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.

Second, how to report holidays without holidays?

Holidays without holidays can be declared in the following ways:

1, complain and report to the local labor inspection brigade and labor department;

2. Labor arbitration can also be submitted to the local labor dispute arbitration committee.

The employing unit shall strictly implement the labor quota standard, and shall not force or force workers to work overtime in disguised form.