Answer:

During the day, in Fremantle, there's fireworks for the Blessing of the Fleet (about noon, and about 3pm). And then about 8pm there's fireworks for the opening of the Fremantle Festival.

About 7.30pm, it's the Cockburn Rotary Spring Fair.

About 9.30, it's the Swan Festival of Lights at Langley Park, celebrating Diwali.