Midsummer is not only celebrated at Stonehenge...
Happy Litha as thousands celebrate Summer Solstice 2018 UK at Stonehenge - Birmingham Live
Awaiting the dawn at Stonehenge: midnight parties - archive, 21 June 1928 | UK news | The Guardian
... but also elsewhere in the West Country:
Summer Solstice in the West Country shaping up to be clear and sunny | West Country - ITV News
Traditional event for midsummer's eve
Thursday, 21 June 2018 - Local People
by Cornish Times
FLOWER garlands, saffron buns and song will be part of a midsummer’s eve event on the outskirts of Liskeard.
The summer solstice bonfire has been organised by the Old Cornwall Society (OCS) for many decades, and used to be held at Castle Park. This year it will take place at Bolitho Farm.
The ancient ceremony, conducted in Cornish and in English, is said to encourage a long and sunny summer in order to ripen the crops for a good harvest.
’Everyone is welcome to help us keep this grand Cornish tradition alive and well in Liskeard,’ said OCS president Brian Oldham. ‘Saffron buns will be provided, but bring your own liquid refreshments.’
The midsummer’s eve bonfire will be held at 6.30pm on Saturday June 23.
Traditional event for midsummer's eve | News | The Cornish Times
It is of course an international thing:
Midsummer — the year′s longest day and shortest night | DW | 20.06.2018