We continue our journey through the Cauldrons Calendar feast/festival/holidays.
His cult originated in predynastic times (4th millenium BCE) and was centred mainly around Coptos.
I have found reference to the festival of the departure of Min - which is a fertility festival at the start of the harvest season where the Pharoah would soe seeds; (there has been some controversial interpretations to say he actually had to ejaculate to ensure the annual flooding of the Nile) these seeds are presumed to have been plant seeds, possibly for the erect Egyptian cos lettuce.
However, as to a Day of the Appearance of Min, I've yet to uncover anything of substance. I'll keep looking and if I find anything I'll add it here. However, as the festival of the departure of Min was in the third month of Shomu and we are now in the fourth month of Shomu, which would still be the harvest season, I wonder if there is a possiblity that Min's appearance is to keep an eye over the harvest.