Second question:
For solo events i could figure out the formula precisely (although there is a factor of 1.15 where i had no idea where it is coming from), but for trios and quintets i was only able to find an approximation.
iirc it's roughly like this:
The idols which are not the leader get about (the margin of error is about 5%):
Number of fans as stated / 2 * 1.2 * highest fan bonus of your equipment (e.g. 1.3 if you have a costume with +30% fans)
If you get an ex clear, multiply that again with 1.15
The leader gets that result * 1.66 (or maybe it was 1.5)
Ehh? wtf are those numbers? It's not that complicated
For solo:You get x1.1 fans for it being a solo live.
You get x1.1 fans for EX clearing a live.
You get xXX% for +fans item equpped (only the highest one works).
For group live:You get x1.15 fans for EX clearing a live.
You get xXX% for +fans item equpped (only the highest one works).
Leader gets 100% of fans multiplied by all multipliers.
Anyone else participating gets 60% of what your leader gets.
Examples:Solo. A live with 15750 fans reward. You EX clear it and +15% item is equipped.
Fans you will get: 15750x1.1x1.1x1.15=21916
Group A live with 6325 fans reward. You EX clear it and have +15% item equpped.
You leader will get: 6325x1.15x1.15=8364
Team member 2 will get: 8364x60%=5018
Team member 3 will get: 8364x60%=5018
Total fans: 18400