I feel like it would be very beneficial to everyone who plays and is in an active guild if there were missions specific to the guild. they could be done in teams of 4-8 and would give twice the gold as normal missions. Due to them being done by so many people they should have a muchharder degree of difficulty to complete. the rewards from it (mats, crowns, etc.) will be sent directly into the guild treasury. This way players who grind for crowns wont have to burn their own to pay for guild upkeep.
As for the new Event prize box style - I feel like an Olympic themed box would be a fun idea. it can have either new items from the winter Olympics like a ski pole sword, skull sled shield, and the like and have the unique colors of Gold, Silver, and Bronze for the medals.
having a cross promotion of the olympics requires their permission. i cant be certain thats a good idea, but i dont know if its a bad one either.