koreanfestivals1-5, Exercise 1: Dating the seasonal days

Model answer:

Daeboreum: the first full moon of the lunar year (the 15th of the first lunar month).
Dano: the 5th day of the 5th lunar month.
Chilseok: the 7th day of the 7th lunar month.
Hansik: counted as the 105th day after the winter solstice, which falls on 5 April in the Gregorian calendar (4 April in leap years), according to the Cold Food Festival article. It differs because it follows the sun (a solar term, counted in days from the solstice), not a lunar month, so its Gregorian date barely moves.

Sources: Wikipedia, Daeboreum; Dano (festival); Chilseok; Cold Food Festival.