Mothers’ Night (Modranecht) is a holiday celebrating the Mothers, a group of ancestral, prosperity and abundance-giving goddesses called the Disir or Matronae. This celebration was on the eve of the Winter Solstice.
Frigga (Frigg) is associated with the Disir/Matronae and is honored on this night. (Freyja can also be honored here too, but this is about Frigga, so).
Frigga (Frigg) is the Germanic Goddess of the home, hearth, family, childbirth, weaving, spinning, craft-work, artisans, wisdom, folk magic and fate. She is the Queen of Asgard, First of the Goddesses, Mother of the Gods, Queen of Heaven, Wife of Odin, and Mother of Baldr. She is a seeress as well and is the only one besides Odin himself who can sit on Hlidskjalf and see throughout all the Nine Realms.
She is also the Goddess of the Ancestral Mothers (Disir) and Norns. She weaves the clouds and thus, the weather. She is the Goddess of the Orion’s Belt.
I have published an anthology for Frigga which can be found here: Queen of the Hearth: An Anthology for Frigga
I highly recommend Rev. Dr. Tamara L. Siuda’s book, 
Richard Reidy’s book is very dense and extremely traditional. Many Kemetics use his daily ritual from this book in their daily practice. A link to his book is here: 
