To change the event contact listed for your event go to your event and select "Contacts" on the navigation menu to your left.
On the far right of the screen, click the grey "Add Event Contact" button.
From here you can enter the name, email, and phone number you want guests to contact for more information. You can also place additional info to your event as well as add an image.
Please note: If you do not add an event contact it will default to the event creator.