cyclosportive and granfondo
The Milano-Sanremo granfondo is still done, and it will be on 6th June.
The route is 298km and as already said, they are not cyclosportive, but more on the race side.
A cyclosportive IS
The contenders are timed and the results are usually published on some website.
The Marmotte is the grandaddy of such events. The first one was held in 1982. In 1987 there were yet only a few such events (5 in France), but soon after they started mutiplying and spreading, specially in Italy where their development was quicker and more impressive than anywhere else.
Before Yann Contat organized the first Marmotte in 1982, Bernard Piguet in Clermont-Ferrand had been organizing an event of a similar type - not a FFC sanctioned one - but it was a fairly confidential affair. Bernard Piguet is the winner of the 1979 and 1983 Paris-Brest-Paris and he finished 2nd in the 1984 Marmotte.
The most interesting such events (mountain) I know of are
France : Marmotte
Italy: Granfondo dles Dolomites
Austria : Otztaler Radmarathon
Spain : Quebrantahuesos ( a vulture-like scavenger)
Other type of less competitive events in France will be called Randonnée or Brevet. They can be mass-start or not, timed or not.