Oops, it doesn't look like 'Make A Flipagram day' is a national day..

Other days

singles

Singles Day
slime

Slime Day
self appreciation

Self Appreciation Day
unicorn

Unicorn Day
offer

Offer Day
stud

Stud Day
hiv awareness

Hiv Awareness Day
boba

Boba Day
ruby

Ruby Day
fiancee

Fiancee Day