The Halloween party drew about 60 people to upstairs Cucina 1871, raising enough money to fund Applied Behaviour Analysis (ABA) therapy for three Oamaru children until about the end of January.
Cucina 1871 donated all of the profits from the bar, more than $1200, to the trust.
The rest of the money was raised through ticket sales and raffles.
Waitaki Autism Trust chairwoman Yanina Vidal said with no government support for ABA, the trust relied on grants, donations and fundraising to pay for therapists' wages, training, travel and resources.
''It really was an amazing night and with your help we are able to provide some more much-needed ABA therapy to our children,'' she said.
She was impressed by how much effort everyone put in to dress up for the occasion and by the continued support from the Oamaru community.
''It was amazing. They made such a good effort to look great,'' she said.
''You have the people who don't understand much of what we're going through and what it is to have a kid with autism, but they are just so nice and helpful and I'm just very grateful.''
The event provided an opportunity to raise awareness of autism and how ABA therapy helped, she said.
It was also beneficial for the parents of children with autism.
''It's actually good for us, too; we struggle a lot socially because having kids with autism and other problems, you don't go out, you don't have time to go out.''
Ms Vidal thanked all of the sponsors, organisers, bands and supporters for making the Halloween fundraiser a ''great success''.
