April 1: Adopt A Ferret Day

April 2: National Ride your Horse To A Bar Day

April 3: National Chocolate Mousse Day

April 4: World Rat Day

April 5: National Deep Dish Pizza Day

April 6: National Food Faces Day

April 7: Poet In A Cupcake Day

April 8: Pygmy Hippo Day

April 9: National Baked Ham With Pineapple 

April 10: National Report IRS Tax Fraud Day

April 11: National Ranch Water Day

April 12: Drop Everything And Read

April 13: National Silly Earring Day

April 14: National Reach As High As You Can

April 15: McDonalds Day

April 16: Day Of The Mushroom

April 17: National Cheese Ball Day

April 18: National Velociraptor Awareness Day

April 19: National Cat Lady Day

April 20:  National Stop Snoring Week

April 21: National Bulldogs Are Beautiful Day

April 22: National I.T. Service Provider Day

April 23: Talk Like Shakespeare Day

April 24: National Playground Safety Week

April 25: National Hug a Plumber Day

April 26: International Guide Dog Day 

April 27: Love Your Thighs 

April 28: Save The Frogs

April 29: Viral Video Day

April 30: Hairstyle Appreciation

April 31: National Larry Day

Cites 

http://nationaltoday.com

https://www.istockphoto.com/vector/hello-april-spring-related-motivational-quote-isolated-on-white-background-vector-gm912575188-251228887