Lammas or Lughnasadh occurs on the eve of August and/or August 1st.
On the Witches' calendar Lammas is the beginning of Autumn and first of the three harvest festivals. Lammas was the Christian name given this holy day. (Lughnasadh is the older name given to this festival.) Lammas literally means 'loaf mass' for the feast of bread to celebrate the wheat harvest.
The grain god was molded into an edible figure and passed around. Everyone broke off a piece and ate it thereby becoming one with the deity in symbol - clearly the predecessor model for the Christian rite of communion.