Hey Chris. If you like, you can also ask the author via their support forum – http://themeforest.net/item/pressevent-event-management-theme/2196163/support
Here is our Knowledgebase article on selling exclusively – http://support.envato.com/index.php?/Knowledgebase/Article/View/116/
As you can see:
You are entitled to sell other items elsewhere, but not the same ones. This helps keep the marketplaces healthy and unique, and ensures buyers aren’t just browsing through items they could get anywhere. So to sum up:
You CAN sell other items on other sites, including your own.
You CANNOT sell the same items elsewhere.