Awareness days are designated dates used to highlight specific causes, historical figures, or social issues, encouraging public reflection and action. They matter because they focus collective attention on topics that might otherwise be overlooked, fostering education, remembrance, and advocacy.

On April 28, two awareness days are observed. Workers' Memorial Day, also known as International Workers' Memorial Day or International Commemoration Day for Dead and Injured, takes place annually around the world on April 28, an international day of remembrance and action for workers killed, disabled, injured, or made unwell by their work. In Canada, it is commemorated as the National Day of Mourning. For more information, visit: Workers' Memorial Day. The second awareness day is Yi Sun-sin, though no description or Wikipedia link is provided for this observance.