The Pagan Book of Days for Monday, May 9th
Lemuria
The Roman lemures are the wandering spirits of dead family members who revisit their former homes on this day. The shades are acknowledged on the three days of the Lemuria. The other two days when the spirits are abroad are 11 May and 13 May.
Source
The Pagan Book of Days
Nigel Pennick
Witches Of The Craft® 