Set event permalinks to include month and year to prevent slugs being duplicated and having a counter appended
When an event is posted, the permalink is created from the post title automatically.
If the post title is duplicated (e.g. a sports team plays an opponent twice or more), the permalink is appended with "-2" or "-3" etc.
It would be better to have the format that is avaialble to regular blog posts:
<domain name>/<year>/<month>/<current slug>