This annual boating extravaganza will see over 40 beautiful vintage and exquisitely preserved vessels assemble in the central basin of St Katharine Docks in London. These include the war heroes, the Dunkirk Little Ships, motorboats from the Bates Starcraft and Rampart ranges and other impressive working vessels, including two steam tugs. With an array of activities including live music, talks and kids activities, it is the perfect day for all the family
I go every year. Lots of maker-ish interest - engineering, restoration, craftsmanship, nautical gadgets etc
https://skdocks.co.uk/whats-on/classic-boat-festival/
This is part of the Thames Festival which has lots to offer.