Have you been working your way through all the challenges in the Festival App?

At midnight Saturday the ultimate challenge will be revealed for everyone who's completed five or more challenges so far. We can't tell you too much, but it's fair to say you should plan to have some free time in the city tomorrow evening.

If you haven't downloaded the App yet, there's still time to jump on it! Available on Android and iPhone - just search Sydney Festival in the Apple Store or Android Market and look for the yellow balloon.

In the meantime, here are a couple of snaps from all the uploads so far. Check out more here.

Challenge 2 from our Festival App asks you to take a photo of you with a yellow balloon. People got pretty creative with that one, but for simplicity, we're a fan of the one above.

Sydney Festival kicked off with a bang with Festival First Night. Relive the memories or check it out from a different angle with these snaps.

But there's more to the Festival than just First Night. Here's just a couple of venues for starters.

 The Jolly Boys - The Famous Spiegeltent
Deerhoof -  The Keystone Festival Bar

Don't forget to download our App and get amongst it. Who knows you could make a new friend at the Domain in Challenge 5 like these lovely people.