Private jets are ferrying celebrities to Las Vegas and bets worth more than a million dollars are being placed as the most talked-about fight of the year gears up.
The 12-round boxing contest will be beamed to more than 200 countries and territories.
While Mayweather has insisted he will be at his gentleman's club 'Girl Collection' again tonight, McGregor has opted for some quality family time.
The Irishman, known for his sartorial flamboyance, was pictured putting the finishing touches to his wardrobe ahead of Saturday's showdown - where he was outshone by his son Conor Junior.
Conor Junior, born in May, was sat on a table in a blue suit and waistcoat, with an orange tie and sunglasses to complete the look.
His long-term partner and Conor Jnr's mother, Dee Devlin, watched on in the lavish surroundings of a penthouse suite while McGregor concluded the fitting session.
Heil was the mastermind behind McGregor's famous 'Eff You' suit, which he wore for the first press conference of the world tour promoting his fight with Mayweather. That is now available to buy for £5,600.
By contrast Mayweather has chosen to spend the week at his gentleman's club and even said he would be there tonight.
He said this Tuesday: 'Believe me, I will be at Girl Collection tonight, Wednesday night, Thursday night and Friday night. Then I'll be back there Saturday night to celebrate knocking McGregor out. All welcome.'
The so-called 'Money Fight' looks set to be one of the most lucrative in history.
Tickets, TV sales, sponsorships and betting could generate close to $600m (£468m) in sales, according to experts, when the two meet on Saturday night.
McGregor, who was once living off unemployment benefit in Dublin, could make more than $100 million, while Mayweather known as 'The Money' could rake in $300 million pushing his career earnings towards $1 billion.
A gaudy 'Money Belt' is also up for grabs to the winner, comprising 3,360 diamonds, 600 sapphires, 300 emeralds mounted in 1.5 kilos of solid gold and set in alligator leather.
Mayweather, 40, who has recorded an incredible 49-0 card and 23 KOs in his glittering 21-year carrer, has come out of retirement for the match.
The Money Man has seen off the likes of Ricky Hatton, Manny Pacquiao and Oscar De La Hoya during his professional boxing career and is aiming to surpass Rocky Marciano's record and move to 50-0.
McGregor, 29, a two-time world champion in UFC, has never boxed professionally and has looked awkward and ungainly during training camp sparring sessions.
He has demonstrated punching power in the UFC, but has never faced an opponent as elusive as Mayweather. He will also be robbed of the kicks, grapples and ground tackles that UFC allows.
Anything other than a convincing Mayweather win will be regarded as a monumental upset.
The big bettors are putting their money on Mayweather, who is 49-0 as a pro. But so many McGregor fans are betting small amounts that the betting slips at William Hill were 18-1 in the Irish fighter's favor.
McGregor fans have flooded sports books with $100 bills backing the mixed martial arts fighter, and even a late surge of money on Mayweather might not be enough to balance the books.
'I'm OK now,' said William Hill oddsmaker Nick Bogdanovich. 'But you might want to have a heart monitor on me when the bell rings and Conor starts throwing wild lefts.'
Bogdanovich said his chain of sports books will suffer multimillion dollar losses - their worst ever - should McGregor win the fight in any fashion.
If he wins early as he has promised, the losses would be even worse.
There have been reports that ticket sales for the fight have been slower than expected and tickets on the secondary markets are selling at a steep discount.
Security will also be beefed up for the fight amid fears terrorists might try to carry out a Barcelona-style atrocity.
Officer Jeff Clark, of Las Vegas police, has urged fans to remain vigilant and report any suspicious activity.
Speaking to the Mirror Online, he said: 'We are constantly evaluating the ever changing world climate and learning from events, such as Barcelona and London.
'We are staffing in excess of 100 special events, most of which are related to the fight, with hundreds of off-duty officers working overtime.'
'It brings up a sad reminder that every city and town could have things happen whether it's intentionally or accidentally.'
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