Gilgandra's Coo-ee Call competition will return after almost a decade when the town roars to life for the first three-day Goin' to Gil Festival, which starts on Friday 27 September.

The Wiggles' companion Dorothy the Dinosaur, Coonamble country artist Max Jackson and ARIA award winners Sneaky Sound System will join a packed lineup for the Under the Gums music event on the Saturday.

The music kicks off at 2pm next to the Cooee Heritage Centre on the Newell Highway.

Free round-trip buses will run from Coonamble, Coonabarabran, Warren and Dubbo for the concert.

"We've got a range of acts. Definitely family friendly in the afternoon," Gilgandra Shire Project Manager of Strategy and Economic Development Kathryn Larkin said.

"We're really looking at how we can engage the community and how we can draw people into the region, boost our economic activity, and get people staying in Gil to enjoy what we have to offer."

General admission to the Under The Gums music event is free and can be booked along with bus tickets online at 123Tix.

Buskers will shake up the main street on Friday afternoon ahead of a parade the next day led by Phat Brass and featuring local vintage cars.

Sunday will also see watermelon eating and Coo-ee Call competitions, the latter returning for the first time since 2015. 

There will also be CWA Markets and a colour run along the Windmill Walk.

"We are very excited to bring back the iconic Cooee Call competition with its link to our local history," Ms Larkin said.

A decibel reader will be used to record the loudest coo-ee from the Royal Hotel balcony, but it will also be judged on clarity and authenticity.

Under the Gums began in 2020 and last year hosted over 3000 people, up from around 1200 the first time.

This year Gilgandra Shire received $125,000 under the NSW government's Open Street Program to assist with funding the Goin to Gil festivities.

"Last year on Saturday night a lot of our accommodation was sold out. We're hoping that we can get a sellout across the entire weekend this time around," Ms Larkin said.