You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Carnival

Context:
The Slovenian countryside displays a variety of disguised groups and individual characters among which the most popular and characteristic is the Kurent (plural: Kurenti), a monstrous and demon-like, but fluffy figure. The most significant festival is held in Ptuj (see: Kurentovanje). Its special feature are the Kurents themselves, magical creatures from another world, who visit major events throughout the country, trying to banish the winter and announce spring's arrival, fertility, and new life with noise and dancing. The origin of the Kurent is a mystery, and not much is known of the times, beliefs, or purposes connected with its first appearance. The origin of the name itself is obscure.

Question:
Where is the most significant Slovenian festival held?

Ptuj