I found a festival called Offering Sacrifice to Nebet Het and Wesir on 13 of Boedromion (mid-September) which is why on the Egyptian calendar I put it on 2nd Akhet Day 13.
On this festival They were offered milk and water mixed with honey, fruit and a cockerel.
As is Greek custom for purifying sacred space, wheat and barley were scattered.
Here is the source: Alvar, Jaime. Romanising Oriental Gods: Myth, Salvation and Ethics in the Cults of Cybele, Isis and Mithras. (Brill Academic Pub, 2008), 313-314.
Fiercely Bright One 