non-event
/ˈnɒnɪˌvent/noun
1- a disappointing or insignificant event or occasion, especially one that was expected or intended to be exciting or interesting（尤指预期会令人兴奋或有趣结果却）令人失望的事, 无足轻重的事。
1.1
- an event that did not happen未发生的事。