The spanish rebels stormed parliament and took the govenor of Spain hostage. I don't know if they think this as a special day but that's what happend on 23rd feb 1981.
On February 23, 1981 in Spain, the Spanish government suffered a coup now referred to as 23-F or El Tejerazo from the name of the most visible figure in the affair, Antonio Tejero, who stormed (according to Wikipedia's article) "into the Spanish Congress of Deputies with a group of 200 armed Guardia Civil agents during the process of electing Leopoldo Calvo Sotelo as the new Prime Minister."
23 February 1994 was a Wednesday.
February 23 was a Friday in 1996.
February 23 2010 was a Tuesday.
February 23 1989 was a Thursday
February 23 1968 was on a Monday.
February 23, 1969 was a Sunday.
February 23, 1976 fell on a Monday.
February 23, 1945 fell on a Friday.
February 23, 1941 fell on a Sunday.
February 23, 1961 fell on a Thursday.
February 23, 1999 fell on a Tuesday.
February 23, 2007 fell on a Friday.