To add my 2 cents.

1: The fate isn't as what it seems at first and at best they should have written it better - when you pick your color - your just really picking your favorite singer...there's no real impact honestly.
2: The fate is very straight forward - just watch the NPC's - you don't need to stick to one singer - you simply pick a random singer that's target-able - and match the color - so if the blue one sings - you use the blue sticks - red ...red....and so forth. You can rotate through each singer - provided you MATCH the color - you will always get 2 certs. I did this after my first two "learning" attempts for an hour straight and managed to get the same reward every time. There doesn't appear to be a "2x" bonus either - As the max reward is 2 cert's from what I observed. Sticking to one singer color only is actually worse - did that first time and only got 1 cert.
3: The website is misleading - I've already filed a complaint - it infers you get the clothes as a reward and other things - when in fact this is not the case - its like they got lazy and used last years graphics and didn't bother giving a damn about being accurate. It would be different if they showed you getting emotes and the furniture set piece...but it didn't at the time I looked - nor have I got a reply. Expectations? Acknowledgement they messed up - beyond that i don't care too much - yes its on mogstation - but still they should be more accurate in the description.

Have to admit...aside from my complaint - best event yet so far.