What happened on April 28 ?

Roman Empire - first day of the Floralia in honor of Flora.

Bahá'í Faith - Feast of Jamál (Beauty) - First day of the third month of the Bahá'í Calendar.

National Day of Mourning in Canada to commemorate workers killed, injured, or suffering illness due to occupational hazards and accidents.

World Day for Safety and Health at Work, which developed from the Canadian observance.

Arbor Day - legal state holiday in Nebraska, USA.

Feast day of the following saints in the Roman Catholic Church: Saints Theodora and Didymus

Arthemius

Saints Vitalis and Valeria

Patritius

Luchesius

Louis Marie Grignon of Montfort

Peter Chanel

National Heroes Day - public holiday in Barbados in honor of men and women who played a significant role in the island nation's history, such as Sir Garfield Sobers.