First of all, from the application, it is definitely not for counselors. Counselors don't have this right. They should apply to the Youth League Committee of the school or the Ministry of Culture and Entertainment. If you are willing to organize a performance, it will be more difficult. If your band members have student union cadres, it is relatively easy to talk. The activity application requires a written plan, including a safety emergency plan. If you do all this yourself, it's very complicated. If you have good friends in the student union, you can do relevant consultation.
Then if you cooperate with the entertainment department or the musical instrument club, the resistance will be much reduced. Equivalent, the department built a platform for you, and you saved a lot of trouble. To play musical instruments at school, you'd better have a good relationship with these departments and strive for a win-win situation.