Party-goers who work up a hunger will be able to buy food and drink.
The event begins at 5.30pm and ends at 7pm. Entrance is $2 for children and parents get in free.
If the weather is wet, the party will switch to Holy Trinity Church, Devonport Rd.
Children's ministry co-ordinator Rob Cooke said last year's event proved a big success and a joint party with other churches made sense.
"We thought that if we combined our churches and had an event that was a lot bigger it would generate much more energy," Mr Cooke said.
There were hidden dangers for kids who dabbled in Halloween, he said. In extreme cases, children could get lulled into interests linked to the occult.
"If we can offer an alternative to Halloween that's fun and enjoyable they'll tend to stay away from the darker side of things," he said.
Rev Paul Williamson, vicar of Holy Trinity, said Halloween was increasingly popular.
"Some people are quite uneasy with it. A lot people are finding it quite threatening at their homes," he said.
Trick-or-treating could feel intimidating for some residents with youngsters banging on doors, he said. "The Light Party provides an opportunity to extract the fun part of Halloween and enjoy it together."