Chika's treasure hunt is started through your TV in the living room, it will give you all the quests you need.
You can also exchange Christmas Coupons for the recipe using the TV.
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...👍)