Very tall Agenda Widget

On the site I run (http://solbjerg.soesport.dk/wp) we have an Agenda Widget in the right hand bar. This agenda widget is extremely tall with tons of whitespace after the content. This has the annoying effect of forcing the remaining widgets down to the very bottom of the page where they are easily overlooked.

Is it somehow possible to force the Agenda Widget only to take up the space of the content in it? This was how it worked with a different theme we used before.

Otherwise, we are very happy with the looks of the theme 🙂