Vivid is definitely something worth seeing, sydney harbour filled with light artwork all night and day. The art is absolutely stunning at night time, and the event goes all out projecting artwork and creations onto buildings such as town hall, the opera house and other miscellaneous buildings.
There are also intereactive events such as 2 player games projected onto building walls, "stand and make your own light-paint splatter" onto buildings as well as being able to walk through and around all the light sculptures.
Vivid is always full of stalls and stores so there will be lots of food and shopping options available for you whilst you spend the night searching through the light artwork. It's definitely family friendly although there may be pretty big crowds at times it is definitely, definitely, definitely worth going to.