List of Teachers' Days

Teachers' Day (Paraguay)

Public holidays in Russia

Russian State Fire Service Day (Russia)

Rincon, Bonaire

Rincon Day (Bonaire)

Reunification Day

Reunification Day (Vietnam)

Persian Gulf naming dispute

National Persian Gulf Day (Iran)

Walpurgis Night

May Eve, the eve of the first day of summer in the Northern hemisphere (see May 1):
Walpurgis Night (Central and Northern Europe)

Beltane

May Eve, the eve of the first day of summer in the Northern hemisphere (see May 1):
Beltane begins at sunset in the Northern hemisphere, Samhain begins at sunset in the Southern hemisphere. (Neo-Druidic Wheel of the Year)

Martyrs' Day

Martyrs' Day (Pakistan)

International Jazz Day

International Jazz Day (UNESCO)

Honesty Day

Honesty Day (United States)

Public holidays in Thailand

Consumer Protection Day (Thailand)

April 30 (Eastern Orthodox liturgics)

Christian feast day:
April 30 (Eastern Orthodox liturgics)

Suitbert the Younger

Christian feast day:
Suitbert the Younger

Sarah Josepha Hale

Christian feast day:
Sarah Josepha Hale (Episcopal Church)

Quirinus of Neuss

Christian feast day:
Quirinus of Neuss