SATURDAY's acoustic performance from X-Factor winner Reece Mastin gave Fun4Kids it's first ever capacity attendance with 4300 tickets sold in one day.
The sell-out show made this year's festival the biggest in the past five years, with 25,500 people attending over eight days.
Festival director Luke Cann said he was surprised just how smoothly the largest day in the festival's history had run.
"It had a really good vibe and we're trying to put our finger on why," he said.
"I suppose it was because our site logistics crew and festival management were able to put things in place to make sure there were no queues anywhere and patrons in the Festival Hall area were managed really well.
"The fact Reece Mastin played an acoustic set probably added to it being less frantic than what we thought it was going to be.
"Activities and workshops throughout that day were really full on as well."
Mr Cann said the total figure of 25,500 people was about 1000 more than last year, largely due to the variety of the program and musical line-up.
"It's something we concentrate on prior to the festival, in pre-planning to broaden those target markets," he said.
"It's certainly worked and Saturday highlighted that when Reece Mastin played to a packed house.
"It was solid in the days throughout the rest of the week as well.
"Monday was down to 60 per cent capacity, but other than that it was from 70 up to the sell-out. Having to turn people away is a good problem to have.
"That's why we promote so heavily because we don't want people to miss out."
He said between 500 and 1000 patrons would be surveyed for feedback on the festival before organisers debriefed and planned for next year.
"We'll get a good picture of what patrons thought of the festival, from site layout to the program on stage and the content of workshops," he said.
"We make assessments of what worked well and what needs to improve ... I think by now we've really refined it into a fine art and there's rarely any areas with long lines."