They Sydney Opera House does not have a fixed dress code for events
http://www.sydneyoperahouse.com/visi...dingevent.aspx
For musicals, such as the one you are attending, you will find a fair variance of male attire being worn. If you are a person who likes to dress up for a night out, as I am, I would wear the black argyll and also use the same jacket for the ship dinners, as per other posters suggestions.
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