banquet
Vietnam War was an event. It begins with the letter v.
time zone
banquet
Banquet.
An event in the winter Olympics beginning with the letter n is the Nordic Climb.
the ending of an event/unfolding of an event
Exciting Exhilarating Exceptional Egregious
It lasts about eleven days, starting on December 25, and ending on January 6 (which is the main event)
The agricultural era was started sometime around 8000 BC but, it is an era and not an event or a war, it does not have an exact starting or ending date.
The Korean War began in 1950 when North Korea invaded South Korea. It begins with the letter K.
heptathalon
The answer is birth.It's five letters, ending in H. Birth is the act of being born. For example "Susanne is giving birth!".