The popular Off-Grid Living Festival at Eldorado will move to a two-day program in Autumn, 2020.
More than 4000 people attended the inaugural event in 2018 and a similar-sized crowd filled the Centennial Park on Saturday, May 4.
Dates for the third event will be announced soon, but organiser Kate Nottingham said an expanded program was already locked in.
"We had pretty much 100 per cent positive feedback, except for people who couldn't fit everything into the one day," she said.
"Holding it over two days means we can offer more.
"We're expecting a massive year next year in terms of the turn-out, with all the good reviews we received.
"At the moment we're meeting 4000, but we could get up to 6000 per day with 12,000 people through the door potentially in 2020."
Ms Nottingham said visitors had come from as far as Queensland and Adelaide, but mostly Victoria, for the festival.
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"We had 180 exhibitors this year across eight categories and areas we really ramped were sustainable energy and home building," she said.
"People enjoy it because it's really interactive; we don't have static market stalls, but people explaining what they do, how they do it, and showing others how they can too.
"One of the highlights this year for people was the heritage draught horse club's demonstration of non-mechanical ploughing."
Workshops on offer included traditional shirt-making, goat-milking, leather craft, vertical gardens and seed saving.
Do-it-yourself solar set-ups were discussed by Micheal O'Connell, a member of the Alternative Technology Association, which has been sending volunteers to East Timor to install inexpensive solar power systems since 2003.
Other presenters shared their experiences of living without an environmental footprint for decades.
But while the event has proved popular with people who are already living off the grid, Ms Nottingham said it attracted a range of people including young couples wanting a "tree-change".
"It's for anyone who wants to live more sustainably, and it's also just a great family day out," she said.
"We find if it's not fun, it's not sustainable.
"We want to teach people what the small steps are they can take, that have a really big impact."
The Eldorado local said the festival also had positive flow-on effects.
"We support the CFA as they organise parking by gold-coin donation, and all of the accommodation gets booked out," Ms Nottingham said.
"We're looking forward to next year."