High Quality Content by WIKIPEDIA articles! Moomba (also known as the Moomba Festival or Moomba Carnival), held annually in Melbourne, is Australia`s largest free community festival and one of the Australia`s longest running community festivals. It is celebrated during the Labour Day long weekend (over four days, from Friday to the second Monday in March). Moomba is culturally important to Melbourne, having been celebrated since 1955 and regularly attracts up to a million people with a record attendance of 1.7 million set in 1996.