These are holidays that some retail stores and business offer freebies and extras on the day! I really don't know much more than that! I find several sites like this one that have different holidays on the same days..go figure!
Here's October 2019:
Tue Oct 1
International Day of Older Persons
Cause Elderly
Tue Oct 1
International Coffee Day
Food & Beverage Food
Tue Oct 1
National Black Dog Day
Animals Dog
Tue Oct 1
National Fire Pup Day
Animals Dog
Tue Oct 1
National Hair Day Fun
Tue Oct 1
National Homemade Cookies Day
Food
Tue Oct 1
World Vegetarian Day
Food & Beverage
Wed Oct 2
International Day of Non-Violence
Cause
Wed Oct 2
National Custodian Day
Career
Wed Oct 2
National Name Your Car Day
Fun
Funny, Weird National
Wed Oct 2
National Walk and Bike to School Day
Health
Children, Parents
Thu Oct 3
Mean Girls Day
Arts & Entertainment
Movie
Thu Oct 3
National Boyfriend Day
Relationships
Thu Oct 3
National Kevin Day
Fun
Obscure
Thu Oct 3
National Poetry Day
Arts & Entertainment
Fri Oct 4
National Cinnamon Roll Day
Food & Beverage
Breakfast
Fri Oct 4
National Crunchy Taco Day
Food & Beverage
Food
Fri Oct 4
National Golf Lovers Day
Sports
Fri Oct 4
National Taco Day
Food & Beverage
Food
Fri Oct 4
National Vodka Day
Food & Beverage
Liquor
Fri Oct 4
World Animal Day
Animals
Pet
Fri Oct 4
World Smile Day
Special Interest
Activities
Sat Oct 5
National Be Nice Day
Fun
Lifestyle
Sat Oct 5
National Get Funky Day
Fun
Health
Sat Oct 5
National Kiss a Wrestler Day
Sports
Sat Oct 5
National Do Something Nice Day
Special Interest
Activities
Sat Oct 5
World Teachers Day
Education
Educational
Sun Oct 6
National Transfer Money to Your Daughter Day
Family
Sun Oct 6
National Coaches Day
Fun
Activities, Children, Parents, Sports
Sun Oct 6
National Mad Hatter Day
Fun
Crazy, Funny, Pop Culture
Sun Oct 6
National Noodle Day
Food & Beverage
Food
Sun Oct 6
National Plus Size Appreciation Day
Fashion
Cultural, Lifestyle
Sun Oct 6
World Cerebral Palsy Day
Cause
Health
Mon Oct 7
National Frappe Day
Food & Beverage
Funny, Pop Culture
Mon Oct 7
National Child Health Day
Health
Children, Health, Parents
Tue Oct 8
National Fluffernutter Day
Food & Beverage
Tue Oct 8
National Pierogi Day
Food & Beverage
Food
Tue Oct 8
Vijayadashami
Religious
Hindu, Indian Holidays
Tue Oct 8
Yom Kippur
Religious
Jewish
Wed Oct 9
National Pet Obesity Day
Animals
Pet
Wed Oct 9
World Post Day
Government
Historical
Thu Oct 10
National Cake Decorating Day
Dessert
Thu Oct 10
National Depression Screening Day
Health
Health
Thu Oct 10
National Hug a Drummer Day
Fun
Music
Thu Oct 10
World Mental Health Day
Health
Fri Oct 11
Cardi B's Birthday
Arts & Entertainment
Music, Pop Culture
Fri Oct 11
National Coming Out Day
Fri Oct 11
National Kimberly Day
Fun
Funny
Fri Oct 11
National Sausage Pizza Day
Food & Beverage
Food
Fri Oct 11
World Obesity Day
Health
Health
Sat Oct 12
National Farmers Day
Special Interest
Careers
Sat Oct 12
National Pulled Pork Day
Food & Beverage
Cooking, Meat
Sat Oct 12
National Savings Day
Financial
Sun Oct 13
National Fossil Day
Environmental
Historical
Sun Oct 13
Metastatic Breast Cancer Awareness Day
Health
Sun Oct 13
National M&M Day
Food & Beverage
Candy, Chocolate, Dessert, Festivities, Funny
Sun Oct 13
National No Bra Day
Arts & Entertainment
Fashion
Sun Oct 13
Navy Birthday
Federal
Historical, Military
Sun Oct 13
Sukkot
Religious
Jewish
Sun Oct 13
World Hospice and Palliative Care Day
Health
Elderly, Health
Mon Oct 14
Columbus Day
Government
Historical
Mon Oct 14
National Dessert Day
Food & Beverage
Food
Mon Oct 14
National Kick Butt Day
Health
Tue Oct 15
National I Love Lucy Day
Fun
Funny, Pop Culture
Tue Oct 15
Global Handwashing Day
Health
Tue Oct 15
National Cheese Curd Day
Food & Beverage
Cheese, Cooking
Tue Oct 15
National Grouch Day
Fun
Pop Culture
Tue Oct 15
National Latino AIDS Awareness Day
Health
Health
Tue Oct 15
National Mushroom Day
Food & Beverage
Healthy Food
Tue Oct 15
National Pharmacy Technician Day
Career
Health
Tue Oct 15
National Pregnancy and Infant Loss Remembrance Day
Family
Children, Family, Health, Parents
Tue Oct 15
World Maths Day
Cause
Educational
Wed Oct 16
National Liqueur Day
Food & Beverage
Wed Oct 16
Global Cat Day
Animals
Cat
Wed Oct 16
National Boss's Day
Special Interest
Careers
Wed Oct 16
National Feral Cat Day
Animals
Pet
Wed Oct 16
World Food Day
Cause
Thu Oct 17
National Clean Your Virtual Desktop Day
Special Interest
Technology
Thu Oct 17
Eminem's Birthday
Arts & Entertainment
Music, Pop Culture
Thu Oct 17
International ShakeOut Day
Environmental
Health
Thu Oct 17
National Edge Day
Cultural
Cultural, Lifestyle, Pop Culture, Weird National
Thu Oct 17
National Mulligan Day
Fun
Thu Oct 17
National Pasta Day
Food & Beverage
Food
Thu Oct 17
National Pay Back a Friend Day
Relationships
Lifestyle
Fri Oct 18
National Chocolate Cupcake Day
Food & Beverage
Chocolate, Food
Fri Oct 18
National Mammography Day
Health
Health
Fri Oct 18
National No Beard Day
Fashion
Lifestyle
Sat Oct 19
National Fetch Day
Animals
Sat Oct 19
National New Friends Day
Relationships
Sat Oct 19
Sweetest Day
Food & Beverage
Food
Sat Oct 19
World Pediatric Bone and Joint Day
Health
Sun Oct 20
International Sloth Day
Animals
Wildlife
Sun Oct 20
National Day on Writing
Education
Sun Oct 20
World Osteoporosis Day
Health
Mon Oct 21
Back to the Future Day
Arts & Entertainment
Pop Culture
Mon Oct 21
International Day of the Nacho
Food & Beverage
Food
Mon Oct 21
National Apple Day
Food & Beverage
Food
Mon Oct 21
National Check Your Meds Day
Health
Elderly, Health
Mon Oct 21
National Pets for Veterans Day
Animals, Cause
Mon Oct 21
National Reptile Awareness Day
Animals
Pet
Mon Oct 21
National Reptile Day
Animals
Wildlife
Tue Oct 22
International Stuttering Awareness Day
Health
Health
Tue Oct 22
National Nut Day
Food & Beverage
Food
Wed Oct 23
National Boston Cream Pie Day
Food & Beverage
Food
Wed Oct 23
National Croc Day
Fashion
Children, Lifestyle, Pop Culture, Weird National
Wed Oct 23
National Medical Assistants Day
Career
Wed Oct 23
National Paralegal Day
Career
Wed Oct 23
Slap Your Annoying Coworker Day
Fun
Thu Oct 24
Drake's Birthday
Arts & Entertainment
Music, Pop Culture
Thu Oct 24
National Bologna Day
Food & Beverage
Food
Thu Oct 24
United Nations Day
Government
Historical
Fri Oct 25
National I Care About You Day
Relationships
Family, Lifestyle, Parents
Fri Oct 25
Katy Perry's Birthday
Arts & Entertainment
Music, Pop Culture
Fri Oct 25
National Art Day
Arts & Entertainment
Pop Culture
Fri Oct 25
National Breadstick Day
Food & Beverage
Cooking
Fri Oct 25
National Greasy Foods Day
Food & Beverage
Food
Fri Oct 25
World Pasta Day
Food & Beverage
Food
Sat Oct 26
National Chicken Fried Steak Day
Food & Beverage
Cooking
Sat Oct 26
National Pumpkin Day
Food & Beverage
Food
Sun Oct 27
National Mentoring Day
Career
Sun Oct 27
National American Beer Day
Food & Beverage
Liquor
Sun Oct 27
National Black Cat Day
Animals
Cat, Pet
Sun Oct 27
National Pit Bull Awareness Day
Animals
Pet
Mon Oct 28
National First Responders Day
Career
Civic
Mon Oct 28
National Immigrants Day
Cause
Civic
Mon Oct 28
National Chocolate Day
Food & Beverage
Chocolate, Food, National Food Holidays
Tue Oct 29
National Cat Day
Animals
Cat, Pet
Tue Oct 29
National Internet Day
Special Interest
Technology
Tue Oct 29
National Oatmeal Day
Food & Beverage
Healthy Food
Tue Oct 29
World Psoriasis Day
Health
Health
Wed Oct 30
National Checklist Day
Special Interest
Activities
Wed Oct 30
National Text Your Ex Day
Relationships
Cultural, Funny, Romance
Thu Oct 31
National Caramel Apple Day
Food & Beverage
Candy
Thu Oct 31
Halloween
Government
Activities, Candy, Children, Cultural, Family, Festivities