St. Patrick's Day [Mar 13 - Mar 28]

Talk to Judy, and she will explain that she collects Shamrocks for luck, but that monsters are always stealing her things. She wants you to collect 10 Shamrocks for her.
Once you collect the Shamrocks, talk to her again, and she will give you 10 ten nets for the Shamrocks. Now she wants you to capture 10 Leprechauns for her. You will receive 10 nets for each set of 10 Shamrocks you bring her.

The Leprechauns Run Amok

• Starting NPC: [Event Info] Judy
• Reward NPC: [Event Info] Judy
• Objective: You need to hunt monsters to find a Leprechaun, and then catch that pesky Leprechaun with Net! Once you have captured 10 Leprechauns, return to Judy for your Reward!
• Level Requirement: None
• Reward:

1. 25,147 Zulies and a cart schematic (Sporty Green Cart, Clover Wheels or Clover Engine).
2. Zulie and a Leprechaun Box.

source :
http://rose.irowiki.org