There's great food, free entertainment for kids and live music, Interislander general manager Mark Thompson said.
"We're pleased that so many people can enjoy a picnic and entertainment at their local race track. There's something on-course for everyone to enjoy."
The New Zealand Racing Board and Ronald McDonald House Charities (RMHC) have also partnered up for the Interislander Summer Festival at Rotorua as part of a nationwide fundraising initiative.
In each of the eight races at Rotorua, a TAB Racing Tipster will select a horse in the "TAB Summer Selection".
If the selection finishes in first place, the TAB will donate $75 to RMHC. If the selection comes second or third, the TAB will donate $50. Gates open on Sunday at 11am.
-To be in to win the prize pack, email readers@dailypost.co.nz with your contact details and the word "Races" in the subject line. The winner will be drawn Thursday, Christmas Eve, at midday.