Oops, it doesn't look like 'olivia page day' is a national day..

Other days

self appreciation

Self Appreciation Day
brow

Brow Day
kale

Kale Day
nae nae

Nae Nae Day
bounce

Bounce Day
gum

Gum Day
boba

Boba Day
azonto is acceptable

Azonto Is Acceptable Day
slime

Slime Day
pumpkin

Pumpkin Day