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

Other days

carpenters

Carpenters Day
bubble bath

Bubble Bath Day
camera

Camera Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
artists

Artists Day
lisp

Lisp Day
stress awareness

Stress Awareness Day
aloxolt

Aloxolt Day
self appreciation

Self Appreciation Day
my little pony

My Little Pony Day