The first round of tickets for the Sydney and Gold Coast Big Day Out events have sold out, but those who missed out will still have a chance to obtain one of 500 tickets through an online ballot system.

Those who enter the ballot will have a chance to buy up to four of the 500 tickets when entrants are drawn randomly at 9pm each Thursday, beginning from the 23rd of October. The details from the Big Day Out site are as follows:

Registering for the ballot

* Registrations will open at 9am EST Thursday 16th October.
* You will need to complete and submit the ballot registration page on the website.
* Your registration will only need to be completed once and will last for the duration of the balloting weeks.

If you are successful in the ballot

An email will be sent to you within 30 minutes of the ballot draw. This will provide details of how to complete the order, ie, pay for your tickets.

You will be given 5 days to pay for your ticket order (until 9pm EST on the following Tuesday after the ballot). If in this time you have not paid for your order, these tickets will be forfeited and put back into the next week's ballot.

Tickets for Perth Adeliade and Melbourne went on sale this morning.

For full dates and line-up details for the 2009 Big Day Out, click here.

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Do you think the ballot system works? Are you happy to be randomly selected or would you prefer a first in best dressed system? Let us know in the Live Wall comments box to your right.