So far today, more than 100 Halloween tickets have been sold, many of them to people who aren't UW students.
It's a party that city leaders say has simply gotten out of hand.
Last year it cost the city about $600,000.
Selling tickets will hopefully offset some of those costs.
But organizers also hope to curb the vandalism and alcohol abuse.
Laura Whitmore of the Madison Parks Department says, "This is really the hope, that when people show their tickets, get their hand stamped, that it will help stop the violence that we've seen in the past few years."
You can purchase tickets at the 700 block of State street open every weekday from 3:00pm until 9:00pm.
You can also purchase tickets at the parks office on MLK Junior Boulevard from 8 to 4:30.
You can only buy four tickets per person.
But if you live or work on State street, you can get complimentary tickets.
More information on that is available on the website, www.halloweenmadison.com.
And if you didn't get your tickets today, don't worry. There are still 80,000 tickets ready and waiting.