Circles can be any size and at their simplest are cast by the witch raising her wand, athame or finger and rotating slowly, pointing their finger at the ground and imagining white light rising from the ground.
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.
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.