How to get a (small) version of an event cover image?

I want to pick up a small version of the event cover to use in a custom module promoting events.

Is there a way to get this, hyperlinked is possible. I tried to right click the cover to see the image file but it looks like it's a CSS thing. How would I get the image link? (but preferably not the original as presumably that would be big file size)

Thanks!