Madison will charge admission for State Street for Halloween, but buying tickets in advance does not guarantee you will be able to get in. There's a capacity cap of 80,000 people and that includes the people who won't need tickets because they'll be drinking before 7:00pm. Oh, turns out the 80,000 cap isn't a hard cap, either. If a smaller crowd doesn't make the fire marshall "feel safe" then he can limit access at a lower number, too.
Gosh, I hope the Milwaukee Journal Sentinel's expert on partying and puking gets there early. I'd hate to miss a graphic description of the party.