Once you have created an event, you will want to share it with the everybody that participated. To do this you can simply use your browser open your storefront using your unique public address (how to find your address).
Your list of events will be displayed on the storefront landing page. In order to get the address for the specific event you want to share, right click on the event name and select "Copy link address" (the exact wording may differ depending on the browser you use).
You know have the direct link to that event and can share it using many modern tools, such as e-mail, SMS, Facebook, Twitter, etc.