There are two festivals listed for Aset/Isis in the Third Greek Hymn of to Isis-Hermouthis by Isidoros in the Piam/Phiom region.
The hymn mentions that sacrifices, libations, and offerings were given to Aset, Heru and Sobek during the twentieth of the month of Pakhon and Thoth.
So on the Festival of Aset, Heru-sa-Aset and Sobek during the 20 of both Thoth (1 Akhet) and Pakhons (1 Shomu) give offerings, libations and sacrifices to the Gods.
Fiercely Bright One 