Tonight's show marks the first time Hastings has hosted Christmas at the Park, with the event now alternating between Hastings and Napier to promote unity between the two cities.
"The concept has been around in my head for about three years. The key of this event is unity. So to extend that unity to the two cities just makes sense," he said.
While this year's celebration has cost $120,000, it has not been passed on to the audience.
Mr Trim said the event's priority is to be "family orientated" and "affordable".
Entry to Christmas at the Park tonight is free, however those wishing to park in the showgrounds will pay a gold coin donation.
A collection will also be taken during the event and donations will go towards Kaikoura earthquake relief efforts.
Public transport is also on offer, with buses to the event from Napier, Flaxmere and Havelock North. Bus tickets are $2 return, with under-5s free.
The night will entail hours of free entertainment featuring New Zealand bands Avalanche City and Nomad, CrossFit confidence courses, face painting and fairground rides.
Alcohol and glass are banned and people are encouraged to bring their own food, picnic blankets and plenty of sunscreen.
Gates open at 2pm and the entertainment will begin at 5pm.
Further details about the bus routes operating can be found on www.kaisentrust.co.nz.