June 21st, the day of the summer solstice, the height of the sun's power, was marked by midnight fires of joy and by dances. These were believed to strengthen the sun's heat. A blazing wheel to represent the sun was rolled down hill.

"A happy thought.
Give me this cart-wheel.
I'll have it tied with ropes and smeared with pitch,
And when it's lighted, I will roll it down
The steepest hillside."

Hauptmann: Sunken Bell.
(Lewisohn trans.)

Spirits were believed to be abroad, and torches were carried about the fields to protect them from invasion. Charms were tried on that night with seeds of fern and hemp, and dreams were believed to be prophetic.

Lugh, in old Highland speech "the summer sun"

"The hour may hither drift
When at the last, amid the o'erwearied Shee—
Weary of long delight and deathless joys—
One you shall love may fade before your eyes,
Before your eyes may fade, and be as mist
Caught in the sunny hollow of Lu's hand,
Lord of the Day."

Sharp: Immortal Hour.

had for father one of the gods and for mother the daughter of a chief of the enemy. Hence he possessed some good and some evil tendencies. He may be the Celtic Mercury, for they were alike skilled in magic and alchemy, in deception, successful in combats with demons, the bringers of new strength and cleansing to the nation. He said farewell to power on the first of August, and his foster-mother had died on that day, so then it was he set his feast-day. The occasion was called "Lugnasad," "the bridal of Lugh" and the earth, whence the harvest should spring. It was celebrated by the offering of the first fruits of harvest, and by races and athletic sports. In Meath, Ireland, this continued down into the nineteenth century, with dancing and horse-racing the first week of August.