"We see what he's doing and it puts it into perspective what we're doing. If he can do this then I can train for Ironman.
"I think it's going to be amazing to be there.
"Scott is a very strong person. Most people wouldn't even begin paddling."
One person who won't be at the celebration is Guy Nelson. He has been coached by Donaldson for three Ironman races and the ITU Age Group World Long Course Triathlon Championships.
Nelson will instead be receiving treatment for brain cancer, which he said had been mitigated by the skills Donaldson had instilled in him as part of the Ironman training.
"Scott is a key individual who gave me a bunch of skills that have helped me be here today," Mr Nelson said.
"He's had a major impact. He has a really good ability at teaching mental skills and mental strength. Those tools he taught me for applying in long distance triathlon racing have come into play and are very much in the forefront of my battle. I'd love to see him come in; I feel I owe him a huge amount."
He said Donaldson's wife, Sarah, should also receive some recognition for the support she gave to her husband's pursuits.
"As an adult you have your demons from time to time and quite often that can be brought up around the coffee table. Being a wife she bears the brunt of that - Sarah is a vital ingredient in this feat."