Oops, it doesn't look like 'security adviser called russian envoy the day' is a national day..

Other days

unicorn

Unicorn Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
stress awareness

Stress Awareness Day
comfy

Comfy Day
boba

Boba Day
self appreciation

Self Appreciation Day
promposal

Promposal Day
my little pony

My Little Pony Day
coffee

Coffee Day
mean girls

Mean Girls Day