Starting on March 17, Sword of the New World has introduced Spring Fever Festival (see link for details). The event involves Clovers and Spring Maiden located in Coimbra (H3). The rewards are EXP +30% bonus, Soul Crystals, and more. The Clovers can spawn anywhere where monsters have been killed, including Team Arena and Arsene Circus raid mission.
Using the clover essentially broadcast a server-wide message as Spring Fever Festival > your_typed_message. This event probably will last for more than 2 weeks, since you need to participate for 15 days before qualifying for free Strength Potions.