About 300 people, mostly children, donned costumes and attended the annual event promoted as a safe way for children to celebrate the tradition.
Museum volunteer organiser Ann Barsby said it was a low cost, community event intended to give an alternative to trick or treating.
''Lots of [children] came dressed up. It was a lovely atmosphere [and] the people really enjoyed it,'' she said.
A number of activities were run, including mummy making, face painting, bobbing for apples and a fancy dress parade.
Food was provided for the children including a sausage sizzle, popcorn and chocolate and it was a real family occasion, Mrs Barsby said.
It was the second year the event had been staged and Mrs Barsby said it was great promotion for the museum.
''We had a huge number of people here for the first time.
''We're Dunedin's best kept secret.''
