International Museum Day (IMD) is an international day held annually on or around 18 May and coordinated by the International Council of Museums (ICOM). The event highlights a specific theme that changes each year to reflect a relevant topic or issue facing museums internationally. IMD provides an opportunity for museum experts to meet the public and alert them to the challenges that museums face, and raises public awareness of the role of museums in the development of society. It also promotes dialogue between museum professionals.

Source: https://hr.wikipedia.org/