Creates a category of the form "YYYY competitions", where YYYY is a 4-digit year.
e.g.
Usage edit
{{Year competitions category}}
No parameters needed
Errors edit
If the template is used on an invalid page, an error message is generated and the page is categorised in:
- Category:Errors reported by chronology category header templates (population: 1)
Errors include:
- The page is not in the category namespace
- The page's title does not take the form "YYYY competitions"