Note that players only need to be below level 30 when they sign up for the event. So there is a good chance you will face players above level 30 during the event.
If you find a player who is using a card that is banned, take a screenshot and send it to me.
1) Press Print Screen to copy what you see to the clipboard.
2) Open Paint (or another image editing program) and paste the screenshot. Save this.
3) Upload to the web. There are a number of free sites that can host images. Send me the link in a PM.