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You really do not want to have a URL that is considered temporary unless you are changing domains or doing something like building a new website. From a search engine 1st perspective now if you want this thing to rank I think what you should do and tell me if I'm way off okay man is to use a landing page for instance go to http://www.blueprintmarketing.com then where you see the home button in navigation let your mouse hover over it. You will then see a drop down click on that it is a landing page. All landing pages is a separate way to add pages to your site that would work in this situation where you can keep the original site example.com and off of example.com you will not need any example.com/newevent  you simply have the power with landing pages to turn them on and off what framework are you using for WordPress if you don't mind me asking?