Deleting doubles of concerts
Sometimes concerts are added multiple times even though they are the same concert. So sometimes like 5 entries of the same concert exist (for example Rock en Seine is one I attended where I didn’t know which one was the right one to add cause there were so many)

We run processes every night that automatically searches and merges duplicate concerts. We've already merged almost 1,000,000 duplicate concerts! Typically when you find that duplicates still show on the site it's because some of the information doesn't match up. For example, the Venue name or the Location will be slightly wrong. We are continuously working to clean up data like that which will always be an ongoing effort.
As far as fact checking, we have people on our team that do that too but due to the sheer volume of concerts that are always happening we rely on our users to submit corrections and help with that. Thank you!
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Nancy Head commented
This is a great idea. Compile all duplicates and merge and fact check, more so with festivals, that all artists are on there. Ive come across multiple choices for festivals and so.e are just what that user has seen. I guess they may not realize that you can add all artists an then choose which ones you actually saw