Two days observed on 20 March:
- World Oral Health Day: Marked every year to raise awareness and reduce oral diseases. The 2026 theme is ‘A Happy Mouth is a Happy Life’.
- World Sparrow Day: Observed worldwide to draw attention to the sharp decline of house sparrow populations in urban areas. The 2026 theme is ‘I Love Sparrows’.
Both days and their themes are relevant for the important days section of TNPSC examinations.