Synonyms for St John's Day include Midsummer's Day, Summer Solstice, and Bonfire Night. Midsummer's Day is celebrated on June 24th, marking the halfway point of the year and the longest day of the year in the northern hemisphere. Summer Solstice, a term derived from Latin, is also celebrated on June 21st and marks the beginning of summer. Bonfire Night, alternatively known as St John's Eve, is celebrated on the evening of June 23rd and is a time for lighting bonfires, fireworks, and other festivities. Whatever the name, St John's Day celebrations typically involve outdoor activities and ceremonies celebrating the arrival of summer.