Answer:
i think that it shouldn't be their responsibility.
Step-by-step explanation:
Most concerts and music event happen at stadiums, where the workers sell food and stuff like that. usually the wrappers and plates and stuff are paper or plastic. (1) the stadiums could make their containers and cups environmentally friendly. (2) the stadiums can hire people to go around with trash cans through the seats and collect trash every half hour to an hour. (3) when checking bags, the stadium should make sure that no one is bringing anything that could do damage to the environmental. items like cigarettes, plastic (the plastic you throw away), etc..
I hope this helped