My idea would be a new event system. This could be use for Christmas, Easter, Halloween and so on.. The example topic is Christmas.
In missions you can collected “Christmas hats”. Exactly like Donuts but the drop rate is higher. In the already built-in "Christmas missions" the drop rate should be a little higher.
On the top on the left side under the level you can find the event button with the remaining event time. I think three weeks are enough time for the event.
If you click on this button, you can see the event menu.
On the top on the right side of the event menu you can see the collected Christmas hats. There are 3 packages to win. Each package costs Christmas hats. As an example, I once selected items, coins & experience and booster for the packages. Of course you also can take donuts or skill points as gains. The admins have to choice this. ^^
The coins and experience are set to the level. The items should only enter to win at the event and not in the second hand shop. So everyone can see that you have participated.
Let me know if you like this idea. Please push the Like button
credit = nameless