Jetsprint Bay of Plenty event director Pip Minnell said organisers were still speaking to other celebrities about competing.
Tickets for the second stadium V8 jetsprint race meet are being snapped up quickly, with more than five weeks to go before the competition begins.
The 14 corporate boxes at ASB Baypark sold out more than three months before the racing starts and about 3000 general admission tickets have been purchased already.
Jetsprint Bay of Plenty event director Pip Minnell said she was thrilled with the interest.
"We're hopeful for capacity crowds [of 17,500] both days," she said.
"We're extremely pleased with the response ... I think people have been taking advantage of the $10 saving to be made if people book online rather than at the gate."
Last year more than 15,000 people attended the one day of racing.
Next year's event, on January 24 and 25, would include 14 hours of racing over the two days, with round two of the PSP New Zealand Jetsprint Championship Series on the Saturday and the international ENZED Stadium Jetsprints Cup on the Sunday, in which teams from Australia, Canada, the US and New Zealand would compete.
Mrs Minnell said the international teams taking part would be confirmed shortly.
Bay Venues commercial manager Ervin McSweeney said many of the people who attended last year had expressed interest in attending again as soon as it was announced the event would return.
"As the event gets closer ticket sales will pick up," he said. "Normally, the real rush comes in the last couple of weeks."