Here are the festivals for the rest of May for Aset.
21-Day of the Living Children of Nut
23 of May-Festival of Roses/Rhodophoria
28-Procession and Offerings in Djedu (Wesir, Aset and Heru-sa-Aset)
31 of May to 1 of June-Festival of Roses/Rhodophoria
The Children of Nut here are Wesir, Heru Wer, Set, Aset and Nebet Het. (You could include Wepwawet since He is a son of Nut as well).
For the Rhodophoria see my post: Rhodophoria/Rosalia Festival.
Djedu is Busiris (or Per Wesir) a city where Wesir was worshiped alongside Aset and Heru-sa-Aset. Give offerings to these Gods on this day.