This event is hosted in Trackmania and in the title(s) Trackmania² Stadium. You can participate on your own and registration is required. You need to have the title pack Competition Titlepack installed. And there is a map pool that you can contribute to.
All informations can be found on my Discord: https://discord.gg/fuh8u7h
Since every asteri cup edition will have different attritubutes, I can't put it into a general way!
This event has no upcoming dates.