When you create an event on Evensi, you will be asked to add information about it along with uploading an image for your event page.
Once the event has been created, you can add or change the cover image by editing the event.
Go to Events created from the right hand menu, then hover over the Published event you would like to amend.
Click on CHANGE or on the EDIT button at the bottom page. You will now be able to edit any part of your event, including the image.
Simply click on the Paintbrush Image - Design tab (3rd from the top) on the left hand side and select Upload a Cover Image. You can upload it directly from your computer.
As this cover image will be also used in weekly newsletters, please check that the upper part of the image includes the main information (specially if it is a Logo)