Cached in secrecy,
Where none shall interfere
A man with wooden jaw
Waits patiently each year
Hands flung abroad,
As the masked man cries "unscathed!"
In an abode of luxury,
With reservations made
Combatants from a land
Found on distant shores
With an intruder well acquainted
With the sound of people's snores
A shape at the heart
Of an ages-old tale
Followed by what's great and blue,
But isn't a whale
What is it?
Verses 1 and 2 are two ways of describing the same thing, and involve a bit of puns/wordplay. Verses 3 and 4 go together and describe something else, which is a clue to arriving at the correct answer.
The ages-old tale referred to in the last verse happened about 2000 years ago, give or take 33 years. The "combatants from a land found on distant shores" were active about 40 years ago.
The masked man is one of a couple masked men that show up in another common riddle, although surprisingly I couldn't find any version of that riddle on this site.