See the observances and verified observance-history milestones attached to May 27. Each observance keeps its own source and date details.
Selected observance milestones connected to this date, based on reviewed sources.
Strengthened the wider UN institutional framework on protecting the environment in areas affected by armed conflict without replacing the 2001 instrument that created the observan…
West Virginia recognition preceded McQuade’s successful national campaign and the later federal observance.
The cited Law No. 260 is dated May 27, 1949.
The government National Day history gives 27 May 1890 as the date of the law.
French Law no. 83-550 established the territorial abolition-commemoration public-holiday framework, Decree no. 83-1003 fixed 27 May for Guadeloupe, and current Labour Code article L3422-2 p…
French Decree no. 2012-553 specifically added Saint-Martin to the territorial abolition-commemoration schedule with 27 May annually; current Labour Code article L3422-2 lists the Saint-Mart…
European Society for Emergency Medicine (EUSEM) and participating emergency-medicine organizations
IOSF states that it established World Otter Day on the last Wednesday in May; its impact-report timeline records the launch in 2016.
Beauty-industry material published on May 27 states that Booksy designated May 27 as National Hairstylist Mental Health Awareness Day; current observance listings attribute the 2021 creatio…
French Law no. 83-550 established the territorial abolition-commemoration public-holiday framework, Decree no. 83-1003 fixed 27 May for Guadeloupe, and current Labour Code article L3422-2 p…
French Decree no. 2012-553 specifically added Saint-Martin to the territorial abolition-commemoration schedule with 27 May annually; current Labour Code article L3422-2 lists the Saint-Mart…
European Society for Emergency Medicine (EUSEM) and participating emergency-medicine organizations
IOSF states that it established World Otter Day on the last Wednesday in May; its impact-report timeline records the launch in 2016.
Beauty-industry material published on May 27 states that Booksy designated May 27 as National Hairstylist Mental Health Awareness Day; current observance listings attribute the 2021 creatio…
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 →