im strongest on my server but i used to wait untill most ppl are done, and killed my alts so noone looses because of me, now its pretty much impossible to do that, :( Still I had no problems after 2 hours the event started, even managed to get 5 wins with my 2 alts... (i have only around 46K power with 3 star ninjas, so not too OP)
So my advice: wait a few hours.