Article: Other regions host festivities of smaller extent, focused on the reenactment of traditional carnevalic customs, such as Tyrnavos (Thessaly), Kozani (West Macedonia), Rethymno (Crete) and in Xanthi (East Macedonia and Thrace). Tyrnavos holds an annual Phallus festival, a traditional "phallkloric" event in which giant, gaudily painted effigies of phalluses made of papier maché are paraded, and which women are asked to touch or kiss. Their reward for so doing is a shot of the famous local tsipouro alcohol spirit. Every year, from 1 to 8 January, mostly in regions of Western Macedonia, Carnival fiestas and festivals erupt. The best known is the Kastorian Carnival or "Ragoutsaria" (Gr. "Ραγκουτσάρια") [tags: Kastoria, Kastorian Carnival, Ragoutsaria, Ραγκουτσαρια, Καστοριά]. It takes place from 6 to 8 January with mass participation serenaded by brass bands, pipises, Macedonian and grand casa drums. It is an ancient celebration of nature's rebirth (fiestas for Dionysus (Dionysia) and Kronos (Saturnalia)), which ends the third day in a dance in the medieval square Ntoltso where the bands play at the same time.

Now answer this question: What is the ancient celebration for?
nature's rebirth