Red Hat Society Day is observed worldwide every April 25, commemorating the first meeting of the Red Hat Society, which took place in 1998. Founded by Sue Ellen Cooper in Fullerton, California, the Society originated when Cooper gifted a red bowler hat to a friend for her 55th birthday, accompanied by the poem "Warning" by Jenny Joseph. This poem inspired the Society's signature attire, where women over 50 wear red hats and purple outfits, while those under 50 don pink hats and lavender outfits. The Society focuses on social interaction and bonding among women, and typical activities include tea parties, games, crafts, and outings to cinema or theater. The establishment date of April 25, 1998, marks the beginning of this vibrant community for women.