This was originally the beginning of the New Year for the ancient Romans (and the consuls would probably enter office on this date prior to 153 B.C.)
Festival of Mars, which included a procession of the Salian priests around the city singing their mysterious Carmen Saliare
"birthday" of the temple of Juno Lucina
Matronalia -- a sort of 'unofficial' festival during which it was customary for hubbies to pray for the ongoing health of their spouses and give them presents; for their part, the wives apparently served the slaves (sort of like Saturnalia and Mother's Day rolled into one)
293 A.D. -- Co-emperor Maximian adopts Constantius, who is given the title Caesar (and it is possible that Diocletian similarly adopted and conferred a similar title upon Galerius)
2005 -- birth of our dog, named by the rogueclassicist at Tyche, but misheard by the liberi as Tyke ...