Did you complete all the quests?
I've all the story incan do in the game (so normally, i've got all area of the game) I've beat the 3 quest of the event (Playing 45 minute ✅ Beat 30 slime ✅ Cook 10 cookies ✅) except the "Treasure hunt" because it don't want to finish and o've buy all the buyable in the TV less than one time so (present 3 tomes and costum 6 times) I search for the hidden present in all map and I don't think i've miss anyone of them (if there are necessary for the event) so... Did I need to do something else ? (Don't worry, i don't want to participate for the gift card i just wanted to finish the event...) Maybe i need to find Chika ?
(And thanks for taking time with me...👍)
When you start the event on the TV, it gives you like 9 in-game quests. Have you completed them all?
You need to hit Claim on each of those in-game quests to actually complete them.
After completing all in-game xmas quests, the next time you interact with the TV channel it should run the event ending which unlocks the event's gallery entry as well as marking the Treasure Hunt objective done.
Feel free to join our Discord if you're still having issues so I can help you troubleshoot more.