Board Thread:Questions and Answers/@comment-3331402-20160425113039/@comment-26581601-20160425134111

Yeah, this mission can be a little confusing! They even had to change the phrasing in-game to specifically say "the first 5 lessons" a while ago...

And yes, the events in lesson are completely by chance. Sometimes it takes days before I finally get the third special event for some courses, so you just have to keep trying and trying and it'll happen eventually!