Image, by Håkan Sjunnesson, from here.
Family is very important to me, and this is an important day.
"In Western Christian theology, the day commemorates all those who have attained the beatific vision in Heaven. It is a national holiday in many historically Catholic countries.
[...]Other Christian traditions define, remember and respond to the saints in different ways."
In many European countries, including Sweden, the tradition is to light candles and visit the graves of deceased relatives.
Read more here or here for example.
Quote from here.