Lughnasa marks the halfway point in the light side of the year.  For the Celts this was a celebration of the beginning of the harvest, a celebration of Lugh, the sun god who gave his name to both London and Lyons.  For Anglo-Saxons the same festival was called Lammas, from "Loafmass".  Loaves of bread were baked and shared among families and communities.  So enjoy the sunshine and storms, eat well and have a dance.