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
How much the government was obliged to concede, or at any rate did concede, is obvious from what has been stated. The Roman custom, under which the state consulted Etruscan sages in certain emergencies and the government accordingly took steps to secure the traditional transmission of Etruscan lore in the noble families of Etruria, as well as the permission of the secret worship of Demeter, which was not immoral and was restricted to women, may probably be ranked with the earlier innocent and comparatively indifferent adoption of foreign rites.
But the admission of the worship of the Mother of the Gods was a bad sign of the weakness which the government felt in presence of the new superstition, perhaps even of the extent to which it was itself pervaded by it; and it showed in like manner either an unpardonable negligence or something still worse, that the authorities only took steps against such proceedings as the Bacchanalia at so late a stage, and even then on an accidental information.
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Reference address : https://www.ellopos.net/elpenor/rome/3-13-faith-manners.asp?pg=23