The Dynamic Content Gallery is basically a rotating banner. On the standard post edit screen, there is a widget on the right side where you specify the path to the image that you want to use in the rotating ad banner to link to your post.
See http://wordpress.org/extend/plugins/dynamic-content-gallery-plugin/
I’m not going to worry about the sidebars. I just decided to use a different default template for my event posts. I chose one without sidebars.