Wrong data on a card, a broken page, or a question about the site:
One person runs this, so a reply may take a few days.
Include the card or event id and the page you saw it on. Nearly all of this site’s data is re-fetched from source, so a genuine error is usually a bug in how it is read rather than a typo — knowing where you saw it is what makes it findable.
If you represent a rights holder and want something removed, email the address above and it will be taken down. You do not need to send a formal notice first.