February had one and possibly two moveable feasts "(feriae conceptivae)". The Amburbium ("City Circuit") was a purification of the whole city with no fixed date, but seems to have been held in February. The Fornacalia ("Oven Festival") was celebrated by the thirty ancient divisions of the Roman people known as "curiae". Each "curia" celebrated a festival separately under its own leader "(curio)" on various days following the Nones. These dates were established and publicized by the "curio maximus", the chief "curio". Anyone who missed the Fornacalia celebrated by his own "curia," or who didn't know his "curia," could attend a public festival which was always held as the concluding ceremony on February 17. The Fornacalia overlapped with the festival of the ancestral dead that dominated the month, and on its last day coincided with the Quirinalia, a day also known as the Feast of Fools "(feriae stultorum)". "Februarius" was thus such a religiously complex month that during the Julian reform of the calendar, when days were added to some months, it was left as it had been, even though it was the shortest month.