You can find the New Google Data Highlighter in Webmaster tools. You need to confirm ownership of your website to be able to use it, but you should have already authorized your website when you first built it. Google Webmaster can provide a WEALTH of information about your website!
The highlighter will help Google find information on special events or special sections in your websites. When Google crawls your website for information, it will recognize your latest event listings and make them eligibel for enhanced search results.
To try it out, log in to Google Webmaster Tools, select the website you would like to use this on, click on Optimization and then Data Highlighter.
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