There is no one word.
The closest are consequent and subsequent, one implying a cause-and-effect and the other one not. An archaic form was in consequence of, meaning because of.
event
Yes, it is one word, eyewitness, for a person who directly observes an event.
One Day Event
gala
No, the word event is not an adverb.The word event is a noun.
no
The Sanskrit word for event is "kriya."
One option is occasion.
The big event exactly one week after Christmas is the Tournament of Roses Parade in Pasadena California.
The proper word for the completion of one year is "anniversary." This term is commonly used to mark the annual recurrence of a significant event, such as a wedding or the founding of an organization. It signifies a celebration or remembrance of that event occurring one year ago.
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Yes, it is one word homecoming.