Going and Can't Go are built for you to easily track your shows, and stop unwanted notifications. In the below screenshot you can see the show card from the My Shows section of your profile. This is the only place you can set if you are going to can't go.
If Either Are Selected
If you have Going or Can't Go selected you will stop receiving notifications for the show! We know that you don't need to know when a show is if you already have tickets or if you can't make it.
The other purpose for Going and Can't Go is filtering your shows in My Shows. By default we don't show you events you can't go to. If you change your mind and actually can make it just change the filter to All Shows!