Every Day is Tag Day
Every Day is Tag Day is held on April 4. First Saturday in April. This event in the first decade of the month April is annual. 
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Tag Day - A day on which contributions to some public or private charity or fund are solicited on the street, and tags given to contributors to wear as evidence of their having contributed.
To prevent the heartache of losing a pet, American Humane created “Every Day is Tag Day,” a nationwide effort held annually on the first Saturday in April. Each year, approximately 10 million pets are lost in the United States, and millions of those end up in the nation’s animal shelters.
Similar holidays and events, festivals and interesting facts
World Aquatic Animal Day on April 3 (The first ever annual “World Aquatic Animal Day” took place April 3rd, 2020, with the inaugural theme of the aquaculture industry);
Don't Go to Work Unless it's Fun Day on April 3
Find A Rainbow Day on April 3
Tweed Day on April 3
Birthday barcode on April 3 (1973);
Mobile Phone Day on April 3
World Rat Day on April 4
Vitamin C Day on April 4
Hug a Newsman Day on April 4
Walk Around Things Day on April 4
Tangible Karma Day on April 4 (is a company founded by Amber Nicole Dilger in 2005 and her idea was to recycle and reuse);
Tell a Lie Day on April 4
Go For Broke Day on April 5
Read a Road Map Day on April 5
Walk to Work Day on April 5
National Dandelion Day in U.S. on April 5 (unofficial holiday)