Lewis & Short

Rōbīgālĭa (Rūbīg-), ĭum, n. [Robigus], a yearly festival held in honor of Robigus on the 25th of April, Varr. L. L. 6, § 16 Müll.; id. R. R. 1, 1, 6; Plin. 18, 29, 69, § 284 sq.; Fest. p. 267 Müll.; Calend. Praen. s. h. d.; Inscr. Orell. II. pp. 388 and 389; Serv. Verg. G. 1, 151.