Public festivals in honor of Ceres.
The cereals.
Source: Webster's dictionaryIn the early Imperial era, Ovid describes the opening of Cerealia (mid to late April) with a horse race at the Circus, Wiseman, 1995, p.137. Source: Internet
Similar attrition may have been imposed on Liber's cults; his perceived or actual association with the Bacchanalia may be the reason that his Liberalia ludi of 17 March were temporarily moved to Ceres' Cerealia of 12–19 April. Source: Internet