Drupal on Global Accessibility Awareness Day announced that they have taken the GAAD pledge to formalize accessibility as a core value of their framework.
If you still haven't made your website accessible to all, this Global Accessibility Awareness Day uses these modules to make your website more accessible.
United Nations has dedicated April 2nd of every year as World Autism Awareness Day to highlight and bring awareness to the challenges faced by people falling in the Autism spectrum world over.
World Wide Web Consortium(W3C) introduced Web Accessibility Initiative through WCAG. These guidelines helps sites to be sensitive to those with special needs.