* Is there anything special about this event?

There will be a new crop: Carnations

Each player above level 4 (maybe level 2 ?) will receive 5 seeds automatically.
If you drop down to zero seeds, there will be an automatic replenishment roughly every 2 hours.
Note: they are not on sale in the Seed Shop, nor the market

* Will Carnations stay in the game after the event?

Yes!
They will stay in the game, but the stats will change.
If you do not have the required level to grow them after the end of the event, they'll wait (invisible) in your inventory until you reach that level.

* What are the items required for this quest?

Level	Task	Required Product	Reward	Required Level
1	Silver Gold Diamond	300 carnation 15 Apples 450 carnation 30 Apples 20 Plums 700 carnation 55 Apples 45 Plums 35 Pears	1100 EP 1100 CC 1600 EP 1600 CC 5200 EP 5200 CC 12 Bats	2 10 16
2	Silver Gold Diamond	450 carnation 355 wheat 750 carnation 600 wheat 450 Potatoes 1250 carnation 900 wheat 950 Potatoes 20 Butterflies	1500 EP 1200 CC 3 Super-Grows 1900 EP 1300 CC 6 Super-Grows 6300 EP 4400 CC 12 Super-Grows 16 Bats	2 7 7
3	Silver Gold Diamond	600 carnation 250 carrots 200 Hay 1050 carnation 525 carrots 425 Hay 25 Sheep 1800 carnation 1000 carrots 900 Hay 55 Sheep	2100 EP 1300 CC 5 Super-Grows 3700 EP 2200 CC 10 Super-Grows 8 Power-Feed 7100 EP 4200 CC 20 Super-Grows 15 Power-Feed	2 10 10
4	Silver Gold Diamond	1000 carnation 10 chickens 1500 carnation 25 chickens 350 Bluebells 2500 carnation 50 chickens 725 Bluebells 25 Olives	3000 EP 2100 CC 4200 EP 2900 CC 1 carnation sticker 10000 EP 7000 CC 4 albino bat	2 24 61
5	Silver Gold Diamond	1250 carnation 1900 carnation 250 Tulips 2850 carnation 520 Tulips 125 Onions	3700 EP 2600 CC 5300 EP 3700 CC 1 Karkonosze Mountain Spirit 14000 EP 10000 CC 36 h All 3 Harvester functions	2 36 65

butterflies (as with any other items) can be bought at the market, if you're lucky, or with BBs: 20 butterflies for 94 BBs, 10 butterflies for 47 BBs, 5 butterflies for 24 BB, 1 butterfly for 5 BB)