Sothic Calender
Kemet used 2 different calender systems, the formal calender - based on politics, the Great House etc.- and the Sothic calender which was based on religious celebrations and began when Sothis (Sepdet) rose in the heavens marking the begining of Akhet (the inundation).
The following is a Sothic calender based on information I have found on festivals and feast days. Dates marked in red below each date are the corresponding days of the Gregorian calender which you will be more familiar with.