pridie kalendas quinctilis
Outside of the wedding anniversary of the rogueclassicist, the closest thing to anything ‘Classical’ for this date is the commemoration of the Protomartyrs of Rome (given a date of 64 A.D.) who were the Christians scapegoated by Nero for the big fire …
rogueclassicism 
Happy wedding anniversary! 🙂
Holford-Strevens (The Oxford Companion to the Year) gives that this day is the dedication of the Temple of Herucles and the Muses, built by Marcus Fulvius Nobilior in 179 BC. It was located on the SW side of the Circus Flaminis and NW of the Porticus Octaviae. He set up a fasti in it no less. It was restored in 29 BC, with a portico, by Lucius Marcius Philippus, who was formerly married to Augustus’ maternal aunt.