"He really was a good man, a lovely and kind man, and this is just something we do to remember him."
Mr Roberts' grandfather was born in Northern Ireland but had spent most of his life in New Zealand. It was his last wish to go back to Ireland to live but he never made it, Mr Roberts said. His family decided to take his ashes to Ireland so that wish could be fulfilled, he said.
"I think he loved New Zealand but I think he always considered Ireland home.
"So cheers to St Patrick, cheers to Ireland and cheers to grandad."
Mr Roberts was one of hundreds of people dressed in green who turned out to Hennessy's Irish Bar yesterday.
The bar gave out prizes and put on live entertainment for the day.
Manager Hillary Hennessy said it was a day staff looked forward to each year.
"It's just a bit of fun really," she said.
"There's a lot of Irish people in New Zealand and it's great for them to be able to celebrate their heritage and where they come from. It's fun for everyone else to join in too."
Staff were dressed in green St Patrick's Day T-shirts for the occasion.
While the day fell on a weekday, Ms Hennessy believed that did not affect business.