the first fa cup final
Yes, "second annual" is correct to use if an event has occurred for the second time as an annual occurrence. However, some style guides recommend using terms like "second-year" to avoid the implication that the event has been established as an annual tradition.
The event after the first and second events but before the fourth, of course!
Football
exploration
A+ answer is exploration.
Battle of Lexington and Concord
exploration
The formation of the Earth is the earliest geologic event.
Johannes Gutenberg invented the first printing press
World War 1
There is absolutely no way to answer this question because the first fermentation occurred eons before mankind was around to record the event.
No, a first-ever event cannot be called annual until it has been held at least once and is scheduled to occur again in subsequent years. The term "annual" implies a recurring event that takes place once a year. Thus, it is more appropriate to refer to the initial occurrence as a "pilot" or "inaugural" event until it is established as a tradition.