This special event was supposed to have begun already but is not yet visible in my game. EG posted this on its forum:
Posted December 14
Mostly, we release only one Event in one version update. However, this time we will be releasing two Events. The first Event (currently running) is for WMotors Lykan Hypersport. The next Championship will be released once the current Event is over. The Pagani event will start on 28/12/2017 at 00:00:00 UTC Time.
Given that the Lykan SE was extended by two days I figure that the start of the Pagani SE was pushed back two days.
