When it comes down to it, it is always individual races which define an era. Silverstone 1979 defined the late 1970s, with Barry Sheene coming up just short of Kenny Roberts, a milestone in the American takeover of Grand Prix motorcycle racing. In 1983, at Anderstorp in Sweden, Freddie Spencer brought the Roberts era to an end, by beating the triple world champion with an outrageously late braking maneuver on the final lap.
In the 1990s, what we might now refer to as the First Golden Age, Hockenheim 1991 typifies the battles between Kevin Schwantz and Wayne Rainey, where quarter was neither asked nor given. The wild scenes at Eastern Creek and Jerez in 1996 marked the rivalry between Mick Doohan and the man came closest to stopping him, Alex Crivillé. Valentino Rossi's arrival in MotoGP may have been spectacular, but his win at Welkom in South Africa in 2004, his first race on the Yamaha since leaving Honda beating arch enemy Max Biaggi, was a watershed in his career. That was the point at which Rossi truly transcended the sport.
When we look back at this period, which will surely be called the Second Golden Age, then Assen 2018, along with the 2015 and 2017 races at Phillip Island, will be the races that fans and pundits point to as the ones which defined the era. Mass battles between multiple riders, hard and close passing in which contact is frequent and accepted, a healthy mix of riders and bikes, of factory and satellite. Battles which rage almost from start to finish, with frequent lead changes, and an almost uncountable number of passes.