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Evergreen date guide

What is celebrated on May 31?

See the observances and verified observance-history milestones attached to May 31. Each observance keeps its own source and date details.

Verified history

On this date in observance history

Today in history →

Selected observance milestones connected to this date, based on reviewed sources.

2018
First observance

National Smile Day

A contemporaneous Daily Herald item submitted by Compassionate Dental Care documents celebration on Thursday, May 31, 2018.

2017
Institutional decision

World Hearing Day

WHA70.13 is dated 31 May 2017 in the official World Health Assembly resolution text.

2017
Later action

World Hearing Day

Established World Hearing Day as a WHO-led health day within the broader World Health Assembly action on prevention of deafness and hearing loss.

1985
Institutional decision

Día de La Rioja

The establishing law is identified as Law 4/1985 of 31 May.

About this date

What this date contains

7 observances

Each observance is shown once in this view, with its own source and scope details available on the guide page.

0 repeat predictably

0 use a fixed annual date and 0 follow a reusable calendar rule.

0 are edition-specific

These dates are shown only for the year or edition that has been confirmed.

4 have a country-specific scope

Country-specific observances are not presented as worldwide events.

7 have in-depth guides

These pages include reviewed meaning, history, activities, facts and FAQs.

Curated global anchors

Major global guides on May 31

See the collection →

A reviewed starting point drawn from prominent global observances with strong institutional or organizer sources. Each observance keeps its own documented status and scope.

Source-backedFixed AnnualIn-depth guide

World No Tobacco Day

31 May · WHO / international observance

WHA42.19

Reviewed depth

Other in-depth guides on May 31

Source-backedFixed AnnualIn-depth guide

National Fisherfolks Day

31 May · Philippines / national fisherfolk-sector recognition

Philippine Proclamation No. 261 (2000) declares May 31 of every year as National Fisherfolks Day.

Source-backedFixed AnnualIn-depth guide

National Save Your Hearing Day

31 May · United States / hearing-loss prevention awareness observance

CDC/NIOSH explicitly identifies May 31 as National Save Your Hearing Day; longstanding professional materials also use the May 31 observance.

Source-backedFixed AnnualIn-depth guide

National Smile Day

31 May · Privately founded smile/dental-awareness observance

A founder-issued press release from Compassionate Dental Care states that Dr. Tim Stirneman and Jim Wojdyla founded National Smile Day on 31 May.

Source-backedFixed AnnualIn-depth guide

National Utah Day

31 May · United States / National Day Calendar National State Days series — Utah

National Day Calendar lists the private May 31 National Utah Day. The U.S. Senate records January 4, 1896 statehood. Utah Division of Indian Affairs sources document eight federally recogni…

Source-backedFixed AnnualIn-depth guide

Necrotizing Fasciitis Awareness Day

31 May · United States / awareness day repeatedly recognized by state proclamations

State government proclamations in multiple years designate May 31 as Necrotizing Fasciitis Awareness Day, supporting a recurring commemorative date while not making it a federal holiday.

Source-backedFixed AnnualIn-depth guide

World Parrot Day

31 May · Global / World Parrot Trust conservation and welfare observance

World Parrot Trust states that World Parrot Day began in 2004, is observed each May 31, and continues as a WPT-led global conservation and welfare campaign.

Explore the mix

Topics represented on May 31

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Health, Wellness & Awareness 3Workplace, Professions & Appreciation 1Celebrations & Social 1Civic, Remembrance & History 1Animals, Nature & Environment 1
7 observances

All observances on this date

Source-backedFixed AnnualIn-depth guide

National Fisherfolks Day

31 May · Philippines / national fisherfolk-sector recognition

Philippine Proclamation No. 261 (2000) declares May 31 of every year as National Fisherfolks Day.

Source-backedFixed AnnualIn-depth guide

National Save Your Hearing Day

31 May · United States / hearing-loss prevention awareness observance

CDC/NIOSH explicitly identifies May 31 as National Save Your Hearing Day; longstanding professional materials also use the May 31 observance.

Source-backedFixed AnnualIn-depth guide

National Smile Day

31 May · Privately founded smile/dental-awareness observance

A founder-issued press release from Compassionate Dental Care states that Dr. Tim Stirneman and Jim Wojdyla founded National Smile Day on 31 May.

Source-backedFixed AnnualIn-depth guide

National Utah Day

31 May · United States / National Day Calendar National State Days series — Utah

National Day Calendar lists the private May 31 National Utah Day. The U.S. Senate records January 4, 1896 statehood. Utah Division of Indian Affairs sources document eight federally recogni…

Source-backedFixed AnnualIn-depth guide

Necrotizing Fasciitis Awareness Day

31 May · United States / awareness day repeatedly recognized by state proclamations

State government proclamations in multiple years designate May 31 as Necrotizing Fasciitis Awareness Day, supporting a recurring commemorative date while not making it a federal holiday.

Source-backedFixed AnnualIn-depth guide

World No Tobacco Day

31 May · WHO / international observance

WHA42.19

Source-backedFixed AnnualIn-depth guide

World Parrot Day

31 May · Global / World Parrot Trust conservation and welfare observance

World Parrot Trust states that World Parrot Day began in 2004, is observed each May 31, and continues as a WPT-led global conservation and welfare campaign.

How dates are selected

This page combines fixed annual dates, reusable calendar rules and year-specific dates confirmed for 2026. Variable or historical dates are included only when they are clearly supported.

Read the methodology →