World Interiors Day or Interior Designer Day
World Interiors Day or Interior Designer Day is held on May 24. Celebrated on the fourth Saturday in May. This event in the third decade of the month May is annual. 
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Interior design and interior architecture are impacting lives throughout the year, over decades and across continents. Exploring the connection of the built environment to shaping relationships and human behavior, Interior Architects/Designers have the ability to push all boundaries.
The International Federation of Interior Architects / Designers (IFI, founded in 1963) is the global voice and authority for professional Interior Architects / Designers. It is the singular international federating body for Interior Architecture / Design organizations. IFI acts as a global forum for the exchange and development of knowledge and experience in worldwide education, research and practice. IFI connects the international community to further the impact, influence and application of the design of interiors, promote global social responsibility and raise the status of the profession worldwide.
Hosted annually, World Interiors Day (IFI WID) is a long-standing program that engages a broad range of people and communities around the world. The program is structured around a theme selected by IFI’s professional community of Interior Architecture/Design associations and their members around the world.
Source: ifiworld.org
Similar holidays and events, festivals and interesting facts
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World Schizophrenia Day on May 24
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Salvadoran Librarian's Day on May 25
Honduran Journalist's Day on May 25