OK Ok, I get what youre all saying, but first hear this, as theres a lot of confusion. The MGP has been going for years, and still is, and its still for amateurs to cut their teeth on. If your good, and can get the backing, then you can progress to the TT. The races at the MGP are the Newcomers, which is self explanatory, and very very good. Then theres the Junior which is mostly 600s, the Supertwins which is 650 twins, and the Senior which is the big bikes. This is the MGP, and the newcomers also compete on the other three classes mentioned above, of they so wish.
The Classic is a totally separate event, started in 2013, because numbers coming to spectate at the MGP races were dwindling, and the event faced extinction. It is the big name road racers on older bikes. there is plenty of controversy over what constitutes these classes, but roughly they consist of the 500s, the 350s, the F1, which is big bikes over twenty years old, and this year, 250 two strokes. So altogether, theres eight races across both events, plus parade laps, plus all the VMCC meet ups, plus the Sprint, plus Jurby day, plus all the other meet ups such as Italian bike night. So I would say, come over, and judge for yourself.