There are release parties around the world, the UK has a party in Cambridge.
Action plan is to go to The Haymakers, High Street, Cambridge and get pizza, drinks and more pizza. at 19:00 Thursday the 29th Feb.
Look for the guy in the blue KDE T-shirt.
Sign up at https://community.kde.org/Promo/Events/Parties/KDE_6th_Megarelease#Cambridge