是状语还是定语

Traditionally,college students hold a graduation ceremony to encourage themselves befroe they set off on their life journey. encourage themselves 是作状语还是作定语修饰ceremony?该如何剖析？

不定式encourage themselves 作目的状语，说明举行毕业典礼的目的。好似have a meeting to disscuss the question 一个道理，动词不定式所表示的动作是由主语发出的，而非ceremony 或meeting。