Higan is a seven-day Buddhist memorial service held three days before, after and on the spring and autumn equinox (Mar. 21 and Sep. 24) to honor loved ones who have died.
According to Japanese tradition, you are supposed to present certain kinds of money in certain envelopes when you attend a wedding, funeral or memorial service.
As you see more and more shopping malls and super markets open on Okinawa these days, the word Depachika seems a little outdated, especially to those who are more used to casually shopping at shopping malls.