Hi,
Thanks for using the Events Calendar.
Here on the pre-sales forum, I’m afraid we do not provide technical support. I would ask that you take any technical support questions across to our wordpress.org forum – our staff scan it periodically and other community members may also be able to help out.
The Events Calendar
Also, we currently have no csv image import feature, but it will be included in our 4.1 release, which we hope to get out before the end of the month.
We also have no default feature image option, but there maybe a plugin on WordPress.org that can do that for custom post types. Ours is tribe_events.
Thanks again!