Setup a new micro course to be used just for this (perfect for memberships). Again the goal is something "micro" (which is less than "mini"). One thing. I would say create one chapter that has two lessons.
Lesson 1 - a simple video or even a PDF to read -Enable lesson prerequisite
Lesson 2 - a one question quiz lesson type that is set to "must pass". Make it an easy to get it right type of question (maybe even silly)
Setup a second chapter that is called "See if you won"
For this one you can have a basic video, or text that basically tells them to "Complete the course" to see if you have one.
Announce to your audience that you are offer a prize for the first 20 people who complete the new "course" you just released. Tell them it will go quick and the contest will end in 2 days
After the prize fills up (you will have to watch this for now) - change the Power Pop so that it says a "sorry" message instead.