This is sounding more and more like football =D
Maybe you could set it up so there's 8 drafts and then the top 8 players compete in another playoff (Gives more than 8 people a chance, doesn't have to be 8 drafts though)
It would take some coordination, but it can work.
64 players? Two problems. 1) I do not have supreme organizational skills. I can keep track of 8 players, and maybe up to 16, but after that I would most likely need help.
Problem 2: I'm assuming you are talking about 8 drafts of 8 players each. Every draft must have a time coordination. So lets say I am part of Draft #2, then the other 7 members of draft #2 must all be free at the SAME time. Let's say you are part of Draft #5, then you will not need to be free at the same time as me, but as the other 7 players of Draft #5.
Solution: As i think about this, one idea that may be able to be used is 8 different brackets.
For example: New York Bracket(8 players in Eastern Time Zone, including Canada), U.S Bracket (the rest of the US and Canada), Europe Bracket, Australia Bracket, Japan Bracket, Central America bracket, South American Bracket, etc. etc.
The idea is to have eight seperate draft tournamnents where each emerging victor is entered into another tournament.
Downfalls: A crapload of time must be invested, and there is a chance that the eight emerging people will all have a blissey, which kills my whole orignal idea.
I honestly wouldn't mind more people and I would hate to tell 2 people sorry we are only doing 8 players, I just don't see this many people devoting so much time towards it, if that makes sense.