Planning fallacy
The Sydney Opera House was expected to be completed in 1963. A scaled-down version opened in 1973, a decade later. The original cost was estimated at $7 million, but its delayed completion led to a cost of $102 million.
Sydney Symphony Orchestra
The Sydney Symphony performs around 150 concerts a year to a combined annual audience of more than 350,000. The regular subscription concert series are mostly performed at the Sydney Opera House, but other venues around Sydney are used as well, including the City Recital Hall at Angel Place and the Sydney Town Hall. The Town Hall was the home of the orchestra until the opening of the Opera House in 1973. Since then, most concerts have been taking place in the Opera House's Concert Hall (capacity: 2,679 seats). A major annual event for the orchestra is Symphony in the Domain, a free evening outdoor picnic concert held in the summer month of January in the large city park known as The Domain. This event draws audiences of over 80,000 and is a long-established part of the Sydney summer cultural calendar.