incident-n; 2 Senses

Sense Number 1: a distinct happening, an instance of an event, occurrence

Commentary: INCIDENT[+event][+happening][+distinct][+instance] a single distinct event
NOTE: does not imply a negative or disruptive occurrence (Sense 2)

At dinner he related some amusing incidents from his trip to London.
In five years there was only one incident when John was late to an appointment.
I can't recall any other incidents of seeing that man in front of our house.

WordNet 3.0 Sense Numbers: 1

Sense Number 2: a public disturbance, an upheaval

Commentary: INCIDENT[+event][+happening][+social][+disturbance][+public]
NOTE: always implies a grave, violent or otherwise disruptive, event.
NOTE: a restricted usage of Sense 1, always with a negative implication

The plane lost power in one engine, but returned to the airport without incident.
The police investigated a stabbing incident at the bus station.
There have been several incidents of joggers being mugged in the park.
The shooting of patrol guard constituted a serious border incident between the countries.

WordNet 3.0 Sense Numbers: 2