Middle class Reading aloud by candle light. Playing instruments, singing and enduring performances. Holiday parties, visit with friends. High Society Theater, concerts, amateur performances, parties and receptions. The whole globe uses the Gregorian calendar for business purposes.
Different religions observe calendars going back to their founder.
Then Before 1582 The Julian calendar, though flawed, was used throughout the Christian world. The difference grew from 11 to 13 days in 211 years.