Home Site Map January February March April May June July August September October November December 4 June Whitsunday 7 June Vestalia Roman festival of Vestalia goddess of the hearth started. 21 June Summer Solstice The longest day in the year. June 23 Midsummer's Eve An ancient fire festival when the veil between this world and the next was said to be thin. The actual scientific longest day falls on the 21st but Midsummer has always been celebrated on the 23rd or 24th. () 29 June or Late June Bawming the Thorn Appleton near Warrington, Cheshire. A Hawthorn tree in the centre of the village is decorated with ribbons. The original tree is said to have derived from the thorn at Glastonbury.