Little Athletics is a great way for you and your kids to meet new friends, most meets are on either a Friday night, Saturday or Sunday Morning. Meets usually last about 2-3 hours depending on how many members that club has. Henley is a big club that hold their meets on a Friday night from about 6:30, while my club Tea Tree Gully hold our meets on a Sunday starting at 09:15.
All clubs have one thing in common, parent help, without that nothing happens. But you get great satisfaction by being right their with your child. How great a feeling it is that you can measure your kids own PB, or be their to give them a cuddle when things don't go to well.
I've been involved for about 6 years now with my daughter who is an Under 13 this year, we have made many friends at other clubs as well as our own. The sport is really cheap compared to Soccer or Netball and all clubs offer concessions for 2 or more siblings. Uniforms will cost $50-60.
Track and Field runs from late Sept / early Nov to the last meet (State individuals) at Santos in late March. Cross Country begins first Sunday in May until late July. It's a great, great sport to get into.