ἑορτάζειν
From LSJ
Θνητὸς πεφυκὼς τοὐπίσω πειρῶ βλέπειν → Homo natus id, quod instat, ut videas, age → Als sterblich Wesen mühe dich zu seh'n, was folgt
Greek > English (Woodhouse Verbs Reversed)
(see also ἑορτάζω): hold a celebration, keep festival, keep holiday