One Faith Music, a multi-denominational Christian rock band, will bring its Weapon of Mass Revelation tour to town.

The seven-piece Central Coast band formed five years ago, with a mission to collect canned food for the homeless.

They have since collected 20,000 cans for local parishes to distribute amongst their communities, with Samaritans to be the beneficiary of the Millfield gig.

Band leader Andrew Thompson said the idea for the band came about through four family members, who wanted to record a CD with purpose.

Thompson said they exchanged a CD for seven cans of food at their first show, and the concept evolved from there.

After initially performing "99 percent Christian praise and worship" songs, One Faith's show has been reinvented over the past year to reach a wider audience.

"We wrote a tailored show all about the journey from secular to Christian," Thompson said, adding that everything from Gnarls Barkley's Crazy to Norman Greenbaum's Spirit In The Sky features in amongst Christian songs, including six tracks written by the band.

Saturday's show will be a rare outdoor gig for the band, and they're looking forward to a sunny afternoon with picturesque views.

Guests are encouraged to donate non-perishable food items or toiletries, and to bring a deck chair and nibblies.

Sausage sandwiches and soft drink will be for sale, with all proceeds to Samaritans. There will also be kids' activities.

Gates will open at 1.30pm, with Newcastle artist Sandy Louise taking to the stage at 2pm, followed by One Faith at 3pm.