上周的选举忘记去投票了怎么办？

What happens if I do not vote?
After each election, the AEC will send a letter to all apparent non-voters requesting that they either provide a valid and sufficient reason for failing to vote or pay a $20 penalty.

If, within the time period specified on the notice, you fail to reply, cannot provide a valid and sufficient reason or decline to pay the $20 penalty, then the matter may be referred to a court. If the matter is dealt with in court and you are found guilty, you may be fined up to $170 plus court costs and a criminal conviction may be recorded against you.


http://www.aec.gov.au/faqs/voting_australia.htm#not-vote

收到信要求规定时间解释，如果不解释或者解释不被接受，就罚款

罚款啦