Just make them during weekends (2 days) and switch between "better" times for NA/EU time zones so it will be more or less equal to the player base so ppl like me can join in. I only have spare time during the weekends.
Btw, this is very much appreciated any way you will make it.
PS: You might preamtible ban the insanity, we can't have a mad man win now can we?
Merry Christmas!