May 1

International labour day being celebrated on May 1.
International Labour Day is also known as the International Worker's Day and May Day which is celebrated on international level to promote and encourage the international labour associations.
India celebrated its first Labor day on 1st May 1923 in Chennai.
In many countries including India, May Day is also celebrated as Labor Day. The day originates with the US labor movement in the late 19th century. The history of the movement dates back to May 1, 1886.
On this day several labor unions across the US went on strike, demanding a standard workday of eight hours. On May 4th there was bloodshed in Chicago's Haymarket Square – A bomb thrown by a revolutionist led to the deaths of a dozen people (including several police officers) and the injury of over 100 people.

May 2

World asthma day 2017 observed globally on 2 may 2017.
The World Asthma Day 2017 was observed across the world on 2 May 2017 with the theme 'Asthma: Better Air, Better Breathing'. It is celebrated on annual basis at first Tuesday of May month. This year theme highlights the resurging environmental pollution and its hazardous impacts on health.
World Asthma Day is an annual event organized by the Global Initiative for Asthma (GINA) to improve asthma awareness and care around the world. The Day was established in the year 1998.
As per latest reports by World Health Organization, over 235 million people suffer from asthma across the globe. Asthma is a common lung condition that causes breathing problems.

Ganga Cleanliness Pledge Day to be observed on May 2.
The National Mission for Clean Ganga will observe Ganga Cleanliness Pledge Day on May 2 at various places in the rivers basin states to spread awareness and ensure public participation for the programme.
The events will be organised in Uttar Pradesh, Kanpur, Allahabad, Varanasi, Hardoi, Bithoor and Vidhur Kuti; Uttarakhands Srinagar and Devprayag; Patna and Bhagalpur in Bihar; Sahibganj (Jharkhand) and Kolkata (West Bengal).
Union Water Resources Minister Uma Bharti will attend the events lined up in Vidhur Kuti, Srinagar and Devprayag that day.
The pledge day will be organised at 30 other locations later through Ganga Vichaar Manch, local NGOs and volunteers in association with the state governments.

May 3

World Press Freedom Day being observed on 3rd May.
The United Nations General Assembly declared May 3 to be World Press Freedom Day or just World Press Day to raise awareness of the importance of freedom of the press and remind governments of their duty to respect and uphold the right to freedom of expression.
The theme of the year 2017 is 'Critical Minds for Critical Times: Media's role in advancing peaceful, just and inclusive societies'.
The UN has been celebrating this international day annually since the 1993 proclamation that commemorated the 1991 Declaration of Windhoek.