Sorry for being so cynical but my prediction... McGregor by a knockout...followed by an even more lucrative rematch which Mayweather will win. And then an even more lucrative decider which again Mayweather will win & be restored as the best
Is this an official fight, as in under the control of a supposedly legitimate governing body? Your post makes me wonder. Mayweather has been in WWE on more than one occasion, McGregor is a huge fan and will no doubt end up appearing for them at some point so I'm guessing neither has a problem with a pre-determined outcome.
Might be in tin foil hat territory but something like McGregor doing unexpectedly well but picking up a DQ for an MMA move. Agrees to rematch as long as its at home. Rematch at Croke Park, McGregor wins so back to the States to somewhere like MetLife Stadium in New York for the decider that would be on at a more reasonable time in Europe.
Saying that is this fight as big a deal as they're making it out to be, T-Mobile Arena isn't even sold out. The Pacquiao fight did 4.6m PPV buys and £400m revenue. That's way more than any other Mayweather fight. UFC gets nowhere near those sort of buyrates.