This event is hosted in Trackmania and in the title(s) Trackmania² Valley. You can participate on your own and registration is not required. You need to have the title pack TMOne Alpine installed.
The Retro Series is held in a remake of a TMUF environment every week. One brand new unknown map is played. There's 10 minutes of map discovery, followed by a short Rounds cup on the map.
This event has no upcoming dates.