Green Versus Machine?

On the 2nd of May in Hastings (England) two very different events occur simultaneously. One is the 'Jack in the Green' procession, where people (including the spectators) dress up in foliage. 'Jack' is a dancing, tree-like entity who 'tries to escape' the attentions of attendant Morris dancers, giant figures, drummers etc. Eventually, 'he' is captured and burned (without the person inside) on a hillside. This reputedly enables the summer to start. Very old-fastioned and green-orientated! Meanwhile, near the sea-front, a massed gathering of bikers, zoom up and down the roads on Harley-Davidsons etc. Massed emissions are produced. It's quite a contrast.