Giant bonfires, fireworks, night street processions, night parades w/ illuminated floats, burning papal (rare now) and Guy Fawkes effigies, and probably the best thing of all - running the crowded street carrying large burning tar barrels on their shoulders - look at this link and scroll down through all the pix, it's fookin' wild:

[https://www.amusingplanet.com/2015/06/the-ottery-tar-barrels-burning-festival.html?m=1]