Google launched Data Highlighter for event data in Google Webmaster tool. At initial launch, it's available in English only and for structured data about events, such as concerts, sporting events, exhibitions, shows, and festivals. Data Highlighter is a point-and-click tool that can be used by anyone authorized for your site in Google Webmaster Tools. No changes to HTML code are required. Instead, you just use your mouse to highlight and "tag" each key piece of data on a typical event page of your website.