Lammas, or Lughnasadh, is a cross-quarter festival signalling the start of the end of summer (in the Northern Hemisphere). "Lammas" literally means "loaf mass" and is the first harvest festival of the year-- a celebration of the bread made from the first cutting of corn. Elements of this sabbat include baking & sharing bread, feasting with neighbors, and honoring the powerful force of the summer sun.
According to Pagan beliefs, the corn mother's energy retreats into the last strands of grain as they're cut. Corn & wheat dollies are made from these last sheaves & stalks of harvested grain, and these dolls are kept through winter to be planted with the first seeds of spring. These organic goddess figures affirm reverence for the Earth's cycles of birth, death, and renewal.
Another name for Lammas is Lughnasadh. The Celtic sun god, Lugh, dies as the sun begins to wane. He's also 'John Barleycorn', whose energy has gone into the grain and is cut down as a sacrifice to the fertility of the land. Many churches still carry on the Lammas traditions through the celebration of harvest festivals, where corn is offered in baskets.
These celebrations are tempered by the knowledge that most crops are still growing in the fields with no guarantee of adequate abundance for the long winter. This mingling of vibrant summer energy with the "gathering" energy of the coming season makes Lammas a unique time for solidly expanding toward focused goals, such as perfecting and challenging your skills.