This is the only day of the year when some people think of Earth. The date was chosen in the first trimester of spring to celebrate rebirth both of Earth and hope. World Environment Day and Arbor Day are the only others. Ground Hog Day fits as well.
What fascinates me is how many “days” there on the annual calendar that celebrate human days. Here is the list:

Mothers day Fathers Day Memorial Day Labor Day Thanksgiving Christmas Valentines Veterans St. Patricks
Universal Childrens World AIDS Pearl Harbor Remembrance Human Rights Bodhi Religious Freedom New Years Freedom Martin Luther King Holocast April Fools International Womans Womans Equal Rights May Anzac Bike to Work Victoria Armed Forces St Jean Baptist World Refuge Canada Independence Bastille Indiginous Peoples United Nations All Saints Patriot World Suicide Prevention Grandparents International Day of Peace Constitution Citizenship World Teacher National Coming Out World Mental Health Election International Day for Elimination of Violence Against Women Human Rights Bill of Rights National Wear Red Presidents Leap Read Across America World Autism Paraprofessional Appreciation World Health National Library Workers Workers Memorial National Teachers National Nurses Flag Parents World Population ( and probably others)

This list pays attention to only a small fraction of Earth’s totality. Here is my proposed list to counterbalance the lopsided number of HUMAN DAYS on our calandar:

Cloud day Waterways day Ocean day Lake day Weather day Invertebrate day Solar day Moon day Weed day Sand Dune day Glacier day Mountain Chain day Fruit day World Blood day (except humans) Grass day Plains day Water day Wildflower day American Chestnut day Fish day Endangered species day Bird day Seed day Marsh day Seashore Insect day Water Cycle day Soil day Hissing Cockroach day Horse day Cat day Dog day Tornado day Uurricane day Forest Wildfire day Volcano day Earthquake day Mushroom day Fish Migration and Spawning day Dam Removal day Rock day Mineral day Salt Marsh day Worm day Animal Migration day Open Space day Parks day Cave day, Ecology day Escaped animals day Sex day (except humans) Glacier day Sand Dune day Food web day Food chain day Habitat day Life Cycle day ( except humans) Parasites day Native Species day

I propose that we do nothing on Earth Day and something on all the other days and not think of it as Earth. Think of it as Community.