Calendar
May Day March in Melbourne, Australia on May 6th, 2012. A large poster reads "MAY DAY WORKERS OF THE WORLD UNITE". Photo credit: Johan Fantenberg [Wikipedia]
May Day (1889)May 1st, 1889

International Workers' Day, also known as Labor Day or May Day, is an annual celebration of the working class celebrated on this day, established by the 2nd International to commemorate the 8 hour day strike that caused the Haymarket Affair.

Image: May Day March in Melbourne, Australia on May 6th, 2012. A large poster reads "MAY DAY WORKERS OF THE WORLD UNITE". Photo credit: Johan Fantenberg [Wikipedia]

Black Americans attacked in Memphis Riot, May 2nd, 1866, Harper's Weekly, May 26th, 1866 [blackpast.org]
Memphis Massacre (1866)May 1st, 1866

On this day in 1866, Memphis, Tennessee police were dispatched to break up a block party of black union veterans and their families. When veterans refused to disperse, a scuffle broke out that led to a city-wide race riot.

Image: Black Americans attacked in Memphis Riot, May 2nd, 1866, Harper's Weekly, May 26th, 1866 [blackpast.org]

"The Black Eureka" by Max Brown 1976, pg 115 [unionswa.com.au], showing three strike leaders: Dooley, Clancy McKenna, and Daisy Bindi
Pilbara Strike (1946)May 1st, 1946

On this day in 1946, ~800 Aboriginal agricultural workers initiated the Pilbara Strike. The strike lasted for more than 3 years before improved working conditions were won, becoming one the longest strikes in Australian history.

Image: "The Black Eureka" by Max Brown 1976, pg 115 [unionswa.com.au], showing three strike leaders: Dooley, Clancy McKenna, and Daisy Bindi