On this special day of Mid autumn festival or also known as Moon festival, people worship in temples and hold happy reunions at home. Sons and daughters will bring their family members back to their parents' house for a reunion. Sometimes people who have already settled overseas will come back to visit their parents on that day.
After nightfall they stroll under the stars to view the brightest and fullest moon of the year. Children run around with bright, colourful lanterns in many different designs and shapes. The adults usually indulge in eating many varieties of moon cakes with hot tea. Other traditional treats include pomelo, persimmon, steamed taro dipped in sugar and roasted chestnuts.
Families, relations and friends gather to enjoy the full moon, a symbol of promise for abundance, of harmony and luck. Some will beseech the beautiful Moon Goddess of Immortality for protection as well as family unity.
The traditional food of this festival is the Mooncake, of which there are many different varieties. Moon cakes can be bought in Chinese grocery stores and bakeries. The small cakes are very rich, with fillings made of lotus seed paste with anywhere from one to four salted egg yolks in the centre, lotus seed paste with melon seeds, black bean paste with mincemeat (like the filling of a Christmas pie), and all of the above with assorted nuts. Prices vary depending on the ingredients.
Source : http://www.chinatown.com.au/eng/article.asp?masterid=155&articleid=735