Here's how the Yuletide event works this year.
1) There are red and green ornaments to collect
2) Depending which ornaments are collected MORE.. the price of trading them in will be LESS. So say more green ornaments are collected than red ones... in that case it'll cost 1/2 the number of green ornaments for a prize that it does the red.
3) The prizes are...
- Mini Grouch Pet (green)
- Mini Krampus Pet (red)
And can be redeemed from cubic santa at the end of the event after new years.
So how do you get these ornaments? Well that's a mystery. We will give one clue. There's an official Christmas overworld. Through there you can find the way.
One note about the event. If the winning side's ornaments are worth more that means they will get more pets BUT.. REMEMBER.. you must ALSO consider that it means the losing side's pet will be rarer! and thus possibly worth more in the future. Something to consider for your strategy collecting ornaments.