events and challenges

hi all I want to understand the game a bit more

events and challenges how do they work as in wat makes them appear is there a cool down for each one or is it every so many days etc just want to no why they don't all show up every day

galactic war
issues I have 5*>7* and I still can't complete one and I'm geared a few to 7 jcs on 8 etc any tips there

thanks in advance for any help


Sign In or Register to comment.