阅读中遇到一个句子，A promotional event to release a series of cultural and creative products about Tu Yuanyuan was held in downtown Beijing in December, 2022. 请问各位老师这里的to do 不定式如何分析，作什么成分？目的状语还是event 的后置定语。
这里的动词不定式短语 to release a series of cultural and creative products about Tu Yuanyuan 是event 的后置定语。
