As far as I know there are no requirements for the 20 10x hero draws. People unable to access the event must be having visual glitches and should contact live support and try resolving it with them.
Might: 2.2 Mil
CC IGN: MineCon12
Android T2P going on 8 years strong. Quest to get Maxed BT 35 Dynamica status: Complete.
It seems like today it is fixed, i didn't had "FREE" option yesterday, but it is today, so it is worth to check by those which didn't had this option yesterday.