Every year Mahahiki begins when the
Makali`i (Pleades) constellation first rises in the night sky to the east while the sun sets in the west over the Hawaiian Islands. Makahiki marks the beginning of the new year and a change of seasonal weather patterns. It is a time of feasting, resting, competition and games, and ceremonies. War and unnecessary work are kapu (taboo). The season gives thanks to
Lono, the god of peace, fertility, agriculture, rainfall and music.
Searching the web will give you many resources to learn more about this time in Hawaiian culture. A few good sources are:
Hau`oli makahiki hou!