To celebrate, agere, agitare (the proper word, festivals, birthdays, holidays, etc.): celebrare (to assist by one’s presence in making a numerous assembly; e.g., birthday, marriage-feast: less frequently of a festival). To solemnize a day as a festival, diem prosequi (Nep., Att., 4, extr.). To solemnize a festival for three days, diem festum agere triduum or per triduum; public games, ludos facere or committere. To solemnize divine service, sacra procurare; sacris operari; res divinas rite perpetrare: but, in the modern sense, better *rebus divinis interesse (of the officiating minister).