I don’t know everything about early Catholic church history, but on this date in 506, the Council of Agde took place. If you’re like me, you might be wondering about the significance of this council. Well, thirty-five bishops attended (of maybe twenty-four bishops, eight priests and two deacons). This was the beginning of the practice of giving land in exchange for service. It also addressed the need of giving sufficient land to freed slaves. The most important decision, however, was that hymns were to be sung in cathedrals every morning and night. This was a local council, but it definitely had influence upon the Catholic church as a whole.
For more info:
http://catholicunderthehood.com/2010/09/10/today-in-catholic-history-the-council-of-agde/
http://www.freebase.com/m/09xwjr