A traditional event that has been held since 1994, in the period from July 3 to 7. A large number of tourists come to Sokobanja just for this occasion to participate in the collection of medicinal herbs on the slopes of Ozren, Rtanj, and Device, accompanied by expert guides. On the day of the Orthodox holiday of St. Jovan Biljober, on July 7, a traditional ascent to Šiljak (1560 m) is organized - the highest peak of Rtanj. In addition to such excursions, professional lectures, quizzes, plant parades, sports and recreational games are also organized. The crown of the manifestation is the selection of the most beautiful girl decorated with medicinal herbs and field flowers - "Princess Biljarice".