In what Paul Field called "one of the highlights of their 15 years of being together", The Wiggles were awarded an honorary doctorate degree from Australian Catholic University in 2006. Cook gave an address during the private ceremony honouring them. They were awarded another honorary doctoral degree in 2009 from their alma mater, Macquarie University. The group was named UNICEF goodwill ambassadors in 2008; they held a special concert to raise money for the organisation. In 2010, the four original members of the Wiggles were appointed Members of the Order of Australia for their service to the arts in Australia, especially children's entertainment, and for their contributions and support of several charities. They called the honour their "biggest recognition yet". The group has always invited children with special needs and their families to pre-concert "meet and greet" sessions. According to Fatt, many parents of these children have reported that the Wiggles' music has enhanced their lives, and that children with autism "respond to Wiggles and nothing else". The Wiggles, throughout their history, have visited and performed for patients at the Sydney Children's Hospital every Christmas morning.