We have recently moved the website to SiteGround hosting, and everything seemed to go smoothly. But as the client was adding new upcoming shows, we saw an error show up on the Shows page - this error:
I'm not sure how to correct this, and I don't know much about PHP.
Thanks in advance!
you will need to disable warning messages in production environments. You can either contact Siteground so they will disable all warnings and notices or you will need to follow this guide https://www.wpbeginner.com/wp-tutorials/how-to-turn-off-php-errors-in-wordpress/
Let me know if you need additional help with this.