Litha, also known as the Summer Solstice or Midsummer is the time of the longest daylight hours due to the position of the Earth to the Sun. This falls each year, in the UK, on either the 21st or 20th of June, with it falling on the 20th of June in 2020.
Beltane, or what is often referred to as the fire festival is an observance of the peak of Spring and the beginning of Summer. Beltane celebrates the abundance in nature and fertility. This midpoint between the spring equinox and the summer solstice is rooted in Celtic traditions.