National Thank God It's Monday Day

Takes place two times annually, on the 1st Monday of January and on the 1st Monday of June.

Hashtags:
References:
nationaldaycalendar.com/national-thank-god-its-monday-day-first-monda…
chloeandisabelwithchardonae.wordpress.com/…/national-thank-god-i…
daysoftheyear.com/days/thank-god-its-monday-day/