Hebrew

ḥag - procession, round dance, festival (HALOT 289)

PCS
*ḥagg- - festival (Hasselbach– Huehnergard 2007:420; Kogan 2015: 189)
An ultimate relationship to Gez. ḥəgg ‘law, decree, regulation, canon, rite’ is not to be excluded (Kogan 2015: 189)