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

Other days

polyamory

Polyamory Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
cuddle up

Cuddle Up Day
pampering

Pampering Day
chocolate milkshake

Chocolate Milkshake Day
cursing

Cursing Day
hiv awareness

Hiv Awareness Day
coffee

Coffee Day
get funky

Get Funky Day
believe

Believe Day