World Autism Awareness Day has been held every year since 9 September 1989. It was designated by the United Nations General Assembly resolution "62/139. World Autism Awareness Day," adopted on 18 December 2007, proposed by Qatar, and supported by all member states. The resolution had four main components:
the establishment of 2 April as WAAD
participation of UN organizations, member states, NGOs and all private & public organizations in WAAD
raise awareness of autism on all levels in society
Autism Ontario celebrates World Autism Awareness Day by "Raising a Flag" for autism. Municipalities around Ontario raise a flag to raise awareness for autism in their region.
In 2014 WAAD coincided with Onesie Wednesday, a day created by the National Autistic Society to encourage people in England, Wales and Northern Ireland to show their support for anyone on the autistic spectrum. By wearing a onesie or pyjamas, participants are saying, "it’s all right to be different".