Enlighten Canberra is similar to the Vivid light festival in Sydney, probably not as big though.

It lights up our major landmarks, including the Old Parliament house, Parliament house, The Australian National Library and other Canberran landmarks. Photographic opportunities are amazing

In the early days of the Enlighten festival, which is in mid March - there is a noodle festival as well, sort of similar to multicultural festivals that we have annually.

It's a great family outing and is completely free.
It gets pretty packed around the streets but it's well worth it.

I highly recommend checking it out