Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
The Masked Farce
Other elements of poetry were called into action in the primitive popular carnival, the comic dance or -satura-,(5) which beyond doubt reached back to a period anterior to the separation of the stocks.
5. Cf. I. II. Art
On such occasions song would never be wanting; and the circumstances under which such pastimes were exhibited, chiefly at public festivals and marriages, as well as the mainly practical shape which they certainly assumed, naturally suggested that several dancers, or sets of dancers, should take up reciprocal parts; so that the singing thus came to be associated with a species of acting, which of course was chiefly of a comical and often of a licentious character.
In this way there arose not merely alternative chants, such as afterwards went by the name of Fescennine songs, but also the elements of a popular comedy--which were in this instance planted in a soil admirably adapted for their growth, as an acute sense of the outward and the comic, and a delight in gesticulation and masquerade have ever been leading traits of Italian character.
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Reference address : https://www.ellopos.net/elpenor/rome/1-15-art.asp?pg=8