World Telecommunication and Information Society Day

World Telecommunication and Information Society Day (International)

World Hypertension Day

World Hypertension Day

Navy Day

Navy Day (Argentina)

Liberation Day

Liberation Day (Democratic Republic of the Congo)

International Day Against Homophobia, Biphobia and Transphobia

International Day Against Homophobia, Biphobia and Transphobia

Galician Literature Day

Galician Literature Day or Día das Letras Galegas (Galicia)

Baháʼí calendar

Feast of ‘Aẓamat (Baháʼí Faith, day shifts with March Equinox, see List of observances set by the Baháʼí calendar)

Constitution Day (Norway)

Constitution Day (Norway)

Constitution Day

Constitution Day (Nauru)

Children's Day

Children's Day (Norway)

May 17 (Eastern Orthodox liturgics)

Christian feast day:
May 17 (Eastern Orthodox liturgics)

Restituta

Christian feast day:
Restituta

William Hobart Hare

Christian feast day:
William Hobart Hare (Episcopal Church (USA))

Peter Lieou

Christian feast day:
Peter Lieou

Paschal Baylón

Christian feast day:
Paschal Baylon