Hi I would say the two words are different A festivity is a loud occasion: people eat and drink and generally enjoy themselves A celebration can be quite a solemn ritual However, the two tend to become associated. An example - which your sentence may be referring to - is the Christian celebration of the passion of the Lord which is held in church and is solemn; compared with the more general festivities of Easter, when people have parties, play games, eat chocolate and so on Regards, Dave
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