Events are shown in the "Neuigkeiten" section until their start date has been reached.
As we deploy quite often, this means, that the currently running event will disappear when it's still going.
As we don't know the end date, just show them for 6 more hours.
If a page is not a page bundle, it can't access files in the same
directory via the .Resources variable. So we need to detect this
condition and get the image file in another way.
