Lewis & Short

cōmissātĭo (cōmess-), ōnis, f. [comissor], a Bacchanalian revel, and the succeeding nocturnal procession with torches and music, a revelling, rioting, Cic. Mur. 6, 13; Liv. 40, 13, 3; Suet. Calig. 55; Mart. 12, 48, 11; Gell. 1, 9, 9.
In plur., Cic. Cael. 15, 35; id. Cat. 2, 5, 10; Varr. L. L. 7, § 89 Müll.; Liv. 1, 57, 5; Suet. Vit. 13; id. Tit. 7; Sen. Ben. 6, 32, 1; id. Cons. ad Helv. 10, 9; id. Ep. 51, 1.
The tropes tempestas comissationis and comissatio tempestatis are censured, the former as too bold and the latter as too feeble, by Cic., de Or. 3, 41, 164.