A chalice is a goblet or cup often used in ceremony as well as in spellcraft. In Wiccan ceremonies the chalice is filled with wine and passed around, so that everyone can share the drink. In other traditions it is sometimes filled with mead, often after magickal workings, and shared.
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.