They are a random event that will happen every now and then. There's nothing that can be done to make the event happen.
Click to reveal..
You are offered the chance to buy a card for (from memory) $20. If you choose to buy one you are then told if you won (and how much) or if you lost. Most times I've lost. frown I did win $80 once though.

_________________________
To err is human; to arr is pirate.