Why is the information from my previous event showing on google even though I have updated it?

Have you published your new event but upon doing a Google search find last years pages and links appearing?

When Google indexes websites, it doesn't happen instantaneously. It takes some time for Google's bots to crawl and re-index web pages. This means that even though you've updated your website, Google may still be displaying cached information from its previous crawl.

This is a normal part of how search engines operate, and it doesn't necessarily indicate an issue with your website. Typically, Google will eventually pick up the changes and update the search results accordingly.