Here is some information about the Lineage2,hope it can help you more or less.
You should collect a special nectar from monsters to grow your pumpkin.Once your pumpkin is grown,you can break it open and reveive all kinds of prizes such as potion, armor or weapon enchantment scrolls.Quite interesting.So just enjoy the pumpkin growing contest and hit the Jackpot:
While traveling, the Great Magus Ahuron Raulian of the Ivory Tower helped a poor injured pixy who had broken her leg. As a special gift of thanks, the pixy sent him a box of pumpkin seeds. However, the pumpkins grown from the seeds have begun annoying him by asking for nectar day and night.
Refusing to throw the pumpkin seeds away for fear of angering the pixy, Magus Raulian has asked his agents to travel across the land and give Lineage 2 Adena pumpkin seeds to whoever can get the nectar to raise them. Those who grow their pumpkins and give them nectar just may hit the jackpot!
Nectar Collectors
Event Managers are stationed in villages across Aden and Elmore. Nectar can be found on monsters throughout the world and traded in to the Event Manager for pumpkin seeds. After planting a seed, feeding the Young Pumpkin enough nectar will make it grow. Hitting a pumpkin before it has fully grown will cause it to wilt from lack of nutrition, so be careful!
Once grown, you can break it open to receive a special prize. Prizes can include potions, armor and weapon enchantment scrolls, A Grade Crystals, soul crystals, and more. You must work to break the pumpkin open quickly or the pumpkin will vanish.
Large Pumpkins can only be broken open with a Chrono souvenir weapon, and will require many people in order to break it before it escapes. Chrono Campanas may be purchased from the Event Manager during this event.
Good luck!
