Fornax

The early Romans recognized, under the name of Fornax, a divinity who presided over ovens who is said to have been worshipped that she might ripen the corn, and prevent its being burnt in baking in the oven (fornax.) Her festival, the Fornacalia, was announced by the curio maximus. (Fasti By Ovid) Hartung (die Relig. d. Röm. vol. ii. p. 107) considers her to be identical with Vesta. (Dict. of Ant. s. v. Fornacalia.)

FORNACALIA

a festival in honour of Fornax, the goddess of furnaces, in order that the corn might be properly baked. (Festus, s. v.) This ancient festival is said to have been instituted by Numa. (Plin. H. N. xviii. 2.) The time for its celebration was proclaimed every year by the Curio Maximus, who announced in tablets, which were placed in the forum, the different part which each curia had to take in the celebration of the festival. Those persons who did not know to what curia they belonged, performed the sacred rites on the Quirinalia, called from this circumstance the Stultorum fericce, which fell on the last day of the Fornacalia. ( Ovid) From Smith's Dictionary of Greek and Roman Biography and Mythology

From Fasti By Ovid.

There was more glory in the sword than the plough:
And the neglected farm brought its owner little return.
Yet the ancients sowed corn, corn they reaped,
Offering the first fruits of the corn harvest to Ceres.
Taught by practice they parched it in the flames,
And incurred many losses through their own mistakes.
Sometimes they'd sweep up burnt ash and not corn,
Sometimes the flames took their huts themselves:
The oven was made a goddess, Fornax: the farmers
Pleased with her, prayed she'd regulate the grain's heat.
Now the Curio Maximus, in a set form of words, declares
The shifting date of the Fornacalia, the Feast of Ovens:
And round the Forum hang many tablets,
On which every ward displays its particular sign.
Foolish people don't know which is their ward,
So they hold the feast on the last possible day.