i already asked the team of “The events Calendar” but they figured out that there must be a theme conflict somehow . It does not show all events and there comes a messages “no results”. There is no sidebar.
I tried it with another theme and it worked well.
Here are the links to the support from events calender
and the link to my testpage/events http://test9629.apps-1and1.net/veranstaltungen
Please let me know if you have a solution. If not, i have to try another event plugin.