Singles Awareness Day is a holiday celebrated by single people. It serves as a complement to Valentine's Day for people who are single, that is, not involved in a romantic relationship.
Definition #2 for "singles awareness day"
Singles Awareness Day (S.A.D.) is a holiday for people who are not involved in romantic relationships as an alternative to Valentine?s Day. Those celebrating the event are encouraged to wear the colors green or black to show contrast to the color red associated with Valentine?s Day.