The Summer Solstice in 2021 is on Monday 21 June at 4.32am British Summer Time. There are lots of things happening over the next week to mark the moment when the sun appears to stand still before lengthening days turn into lengthening nights. The Summer Solstice is most celebrated festival of the pagan Wheel of the Year, while traditional midsummer is a few days later on 24 June. Here are pagan events over that time. Many of the ones I list are in London, because that's where I'm based, but some are in other parts of England and I also list oodles of online things you can do wherever you are.
Now - 4 July; Ritual Britain. Exhibition by Ben Edge and the Museum of British Folklore. Venue: The Crypt Gallery (St Pancras), Euston Road, London, NW1 2BA. Open: Noon to 6pm. Free entry. http://cryptgallery.org/