There should be virtual gangs for the events (like Bill Gates, Warren Buffet etc), otherwise it is impossible for solo players to upgrade to level 12 ...
The top gangs are as closed as "the bank on a bank holiday", and if I am not competent enough to put up a gang of my own with at least 10 people online, I can't ever upgrade to level 12...
That just doesn't seem fair...
Well, another solution for this matter would be changing the requirements to upgrade the level...