The local McDonald's outlets - along with Scone and Greta - have been involved in the largest annual fundraiser for Ronald McDonald House Charities (RMHC) Australia for many, many years - and it was no different in 2019.

Hundreds of people ventured to the fast food restaurants on Saturday, November 16, to raise much-needed funds for the charity, which keeps families together while their seriously-ill child undergoes medical treatment.

Several kids' activities and entertainment, as well as a visit from Fire and Rescue NSW Muswellbrook and Singleton crews, added to the fun, carnival atmosphere.

Plus, $2 from every Big Mac sold went directly to RMHC.

Since its inception in Australia in 1991, McHappy Day has amassed more than $46 million for Ronald McDonald House Charities.

"It is the single biggest fundraiser for RMHC each year," chief executive officer Barbara Ryan said.

"And, we were delighted to have Hollywood star Katie Holmes on board as our ambassador.

"Donations and fundraising are vital to allowing us to be able to continue to offer the services we do.

"McHappy Day can have a significant impact on thousands of families from right across Australia.

"The money - from local and national events - goes towards numerous programs, including Ronald McDonald Houses, Ronald McDonald Family Rooms, the Ronald McDonald Learning Program and the Ronald McDonald Family Retreats.

"It's also helped fund the successful openings of three new Ronald McDonald Houses at Westmead, Perth and North Fitzroy over the past two years, as well as the opening of four new Ronald McDonald Family Rooms in Wagga Wagga, Townsville, Newcastle and Perth, and a Ronald McDonald Family Retreat in Busselton.

"So, thank you to everyone who contributed at the weekend."