It's a good question, don't you think? Someone as unstable as this guy has about a 50/50 chance of actually showing up to all these shows on his "tour"… so what is his backup plan?
Nothing you ticket holders are going to like to hear, unfortunately.
If you've got your ticket handy, turn that shiz over and read the fine print. To summarize, if Charlie Sheen decides to back out of his scheduled tour, you're not going to get a refund…unless the show isn't re-scheduled within a year.
So, imagine you're going to his Detroit show tomorrow and Charlie doesn't show up. You're not going to get your money back for a year since he has that long to try again.
Bet if you ask him, those are the trolls rules though, not his, so don't blame him if he flakes and you don't get your $$$.