1 March is the last day of A Photographic Retrospective of the Chinese New Year Parade at Customs House, Circular Quay.
3 March from 19:45 to 22:00(7.45-10.00pm) at Oxford Street and Flinders Street watch colorful and outrageous Sydney Mardi Gras Parade. About 300000 spectators attend parade so get earlier there to take good spot.
18 March from 12:00 to 18:30 (6.30pm) annual Sydney St Patrick’s Day Parade commences from the corner of Bathurst and George Street to Hyde Park.
24 – 25 March check for latest deals at Travel Expo at Fox Studios, Moore Park
31 March from 20:30 to 21:30 (8.30pm-9.30pm) the annual lights-out event Earth Hour will be held. It start couple years ago in Sydney, but now over 5000 cities across 135 countries are involved.
18 January - 6 May Dragons exhibition at Art Gallery of NSW. See dragons depicted in ceramics, textiles, jade, metalwork, calligraphy and painting from the gallery’s collection.

Mardi Gras is great in every country!
Thanks for this quick advice. I’m backpacking to Australia this month. It pays to read something informational like this.
-Jane
I always thought St. Patrick’s Day was observed on March 17th all over the world (by the nations that do so, anyway).