This is the "Event" template. It should be called in the following format:

{{Event
|Supercontext=
|Topcontext=
|Part of=
|Heading=
|HeadingEn=
|HeadingFr=
|HeadingBe=
|Event type=
|Start date=
|End date=
|Hyperlink=
|Imagename=
|Summary=
|SummaryEn=
|SummaryFr=
|SummaryBe=
|Competences=
|EMM access control=
}}

Edit the page to see the template text.