ἑορτάζειν

From LSJ

κατὰ τὸν δεύτερον, φασί, πλοῦν τὰ ἐλάχιστα ληπτέον τῶν κακῶν → we must as second best, as people say, take the least of the evils

Source

Greek > English (Woodhouse Verbs Reversed)

(see also ἑορτάζω): hold a celebration, keep festival, keep holiday

Lexicon Thucydideum

festum diem celebrare, to celebrate a holiday, 3.3.3.