Children were enchanted by Sir Michael Parkinson's reading of The Very Hungry Caterpillar during his visit to The Royal Institute of Deaf and Blind Children's Rockie Woofit Preschool.
The British broadcaster was there to mark the 25th anniversary of the North Rocks school whose mascot he created from his own popular children's book series of the '80s, The Woofits.
But it was another guest speaker who most impressed parent Richard Porter.
He first heard university student Tim Palmer, 19, speak about his experience of life with cochlear implants at an event four years ago.
He said his story and perfect speech gave him hope for his own son Elijah who was diagnosed as profoundly deaf while an infant.
"Hearing Tim speak and chatting to him afterwards was inspirational, really," he said. "There are famous people, but Tim was better. He is the model for what we wanted for our son."
Mr Palmer attended the Rockie Woofit Preschool and graduated from a mainstream high school in 2012. He took a gap year before enrolling in a combined exercise science and international studies degree at the University of Technology, Sydney. Mr Palmer said he had his first cochlear implant at age two and a second at 14.
"These days I couldn't actually imagine life without them," he said.
"When you've gone your whole life without hearing anything, just to pick up sound is quite an amazing thing. Then the process begins of turning what is like a blur of sound into distinctive language."