People can visit a Royal Australian Navy ship and take part in a range of activities.
The Maritime Museum will have gold coin entry and there will be live music. The event runs from 10am to 4pm.
To celebrate the day, the annual Fremantle Harbour Classic yacht race will also be held at the inner harbour of Victoria Quay at 1pm.
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READ NOWThe race is a one of a kind, showcasing exceptional sailing within the confines of the harbour with excitement at every turn. Contact Fremantle Sailing Club on 9435 8800 for details. Free entry.