What role does the infinitive phrase play in this sentenceThe girls got a permit to go backstage after concert?

In the sentence "The girls got a permit to go backstage after the concert," the infinitive phrase "to go backstage" functions as a noun. It is the object of the verb "got" and names the purpose of the permit. The infinitive phrase is essential to the sentence because it provides crucial information about the permit. Without it, the sentence would be incomplete and unclear.