Theres some boss event going on and tis random majin girl comes up to me and keeps fighting me I got some silver coin what is it

and what is a boss event

Ok :P

Boss event is where you basicly kill a Boss with 150,000,000 LP
You must take the Quest do kill 30 majins (Level 55 and under get 4k+ LP Girl majins, above gets boy majins with 7k LP)
Majins drop silver coins which if you get 30 you can turn into gold coins and if you get 3 golden coins you get a Capsule with a C on it. You may also get this if you do CC Dungeon.
No one person can kill the Boss unless there are usually 25+ People there
You get Special Items if you get enough Capsules I believe

Hope I helped :P

Thanks for clearing that up bro :)