Open An Umbrella Indoors Day
Open An Umbrella Indoors Day is held on March 13. This event in the second decade of the month March is annual. 
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Why Is Opening an Umbrella Indoors Supposed to Be Bad Luck? The modern superstition about opening an umbrella indoors most likely stems from the 18th century, when umbrellas were still a relatively new invention. Though there are many studies which justify that these notions don't have any kind of authenticated proof and they are not linked to any religious or spiritual beliefs.
If leaving your umbrella open to dry in the corner of your office makes you slightly uneasy, you’re probably not alone.
Similar holidays and events, festivals and interesting facts
Plant a Flower Day on March 12
Organize Your Home Office Day on March 12
International Twitter Day on March 12
Ken Day on March 13 (is celebrates the occasion in 1961 when Barbie’s long-term on-off boyfriend, Ken Carson, first appeared on the scene, exhibited by his makers Mattel at a toy fair);
Jewel Day or National Jewelry Day in US on March 13
Earmuffs Day on March 13
International Napping Day on March 13
International Ask a Question Day on March 14 (Today, on the 14th March, was Albert Einstein’s birthday in 1879);
Moth-er Day on March 14 (For those who love the insect world);
Learn about Butterflies Day on March 14