Is it illegal for a teacher to be a part-time wedding host?

According to administrative regulations, in-service teachers are prohibited from taking part-time jobs outside. On-the-job teachers belong to the staff of public institutions and all belong to national staff, and there are regulations to restrict their part-time behavior. If a labor contract is signed and managed according to the employment system, then according to the Labor Contract Law, part-time jobs are prohibited only if the contract stipulates or seriously affects the work.