Answer:

First, at 3pm, a rarity: daytime fireworks, for the Blessing of the Fleet at Fremantle Esplanade.

At 7pm, it's a celebration of Diwali / Harbhajan Mann concert in Mirrabooka.

At 7.30, more fireworks for the Blessing of the Fleet.

At 7.50, it's the Cockburn Spring Festival.