Once the event is finished, your last name is removed automatically and Google can't find you anymore. This can take some days for Google to recognize.
I'm still in the Google results
If Google takes too long, you can manually file a request. Paste on this page the url of your listing: https://www.google.com/webmasters/tools/removals Google will check this page for changes and recognize that your last name is gone. This can still take some days for Google to process.