Disable bands from concert entries in which the band was listed but did not play
Provide a specific function that allows users to disable bands from concert entries in which the band was listed on the ticket, poster, marketing, etc but did not play the event, cancelled, etc. For example, Hot Snakes were listed on all advertising material for Riot Fest 2018 but did not play even though Riot Fest 2018 went on as an event. This being said, this function should be unique so that users aren't creating concerts that were cancelled. We don't need a database of concerts that were announced, cancelled, and that no one saw.
I think allowing the listing of cancelled concerts would also be useful. Especially when people might have posters for those cancelled concerts in their collection. Or tickets...