Every event submitted via Line-Up has to have an image. This is a requirement from the publications in our network.
However, as we need an image to list your event, we can be flexible in regards to this. You can submit the venue's image instead of an event image. Also, check out freestock images related to your event, like Morguefile or Unsplash.
Remember, a low quality or fuzzy image will not help you promote your event. Read more about how to create great evening listings here.