For Christians, this weekend brings the second Sunday of Advent (December 8), the season leading up to Christmas. Buddhists around the world observe Bodhi Day, the festival commemorating the day the Buddha found enlightenment. And thousands of Latino Catholics will celebrate the feast of Our Lady of Guadalupe. According to that tradition, the Virgin Mary appeared to an Aztec peasant named Juan Diego in the sixteenth century, leaving her image on his cloak.