a. Mass-consumerism day
b. The day before Boxing Week
c. Christian holiday celebrating the birth of Jesus of Nazereth which is now belived to have occured in May. The reason for this discrepency is probably that the christians assimilated the old celebration of the Winter Solstice (traditionaly held 4-5 days after the actual solstice due to imprisistion in measureing systems (megaliths like Stonehenge are not able to demonstrate that the solstice has occured until a few days after the event)).