expression, godan verb (-su)
cause trouble; cause a disturbance
Used when someone starts trouble, creates a commotion, or stirs up an incident. Often implies intentional or reckless action.
彼は酔っ払って店で事を起こした。
He got drunk and caused trouble at the store.
そんな小さなことで事を起こす
Don't make a fuss over such a small thing.