For those curious about the stone day thingy, it's people in Japan doing a play with words/numbers;
Ichi - One but becomes shortened to "I" when connected to another word
So 11 is usually pronounced as Juichi (10 and 1) but they call "ii" which also means 'good'
Shi/Yon - 2 ways of saying 4 in Japanese so they connect those with 1 so 'ishi' for 14 even though it's usually called Juyon (10 and 4)
Combining all of that results in 'ii ishi' meaning Novembe 14 (11/14) is Good Stone Day
Japanese like to do that with their numbers like Jan 5 for Ichigo (1 and 5) for the Strawberry Day