Sheesh, the event just started and there's already a leader with 8546 tokens. I don't even see how that is possible this quickly after the event started without paying money or cheating somehow. As soon as I saw that, I immediately knew I wasn't even going to bother with trying.
It's not possible w/o paying.
Well, maybe if you had 1,000 heroic summons saved up, and blew through 500M gold in greater portals...but that would take time clicking. So yeah, paying.