Uploading pictures to your event page's media gallery is a great way to give event goers a little taste of what your event is all about. After the images are uploaded they will appear on your event page's About tab for buyers to look at and scroll through.
Hover over the Tools tab, and select Media Galleries.
Click the Create a New Media Gallery button to create your first gallery. Now, give it a name.
Now you can either drag and drop your picture files or select images to upload. Just a heads up, image files cannot be larger that 5 MB in size, must be JPG, GIF, PNG or TIF format and are recommended to be a height of 270 pixels and width of 360 pixels.
Once the photos have finished uploading, you can assign the media gallery to any of your events. Go to the event and scroll down under the Details tab to choose which gallery to assign to each event.