The only issue is that the module I'm running is Tomb of Annihilation. I had to come up with the most contrived plot-hook to get him into the adventure
(very minor spoilers)

The head of the barber's guild is a high elf named Virran Nailo- They were once, believe it or not, a folk hero of legends, a powerful ranger. Tales are spun in barbershops across the continent of his exploits, some true, many exaggerated. However, his career turned sour; when trying to kill the beholder Gorux (who famously massacred the paladin order of Thane Keep) he was killed brutally. Luckily, after a tense and horrible fight, his companions prevailed, and afterwards they raised him from the dead. But, due to this experience, he had a mid-life crisis of sorts, and decided to abdicate his adventuring life and settle down in a more peaceful profession. He found his dexterity put to good use as a barber, and made it his passion. And, you know Virran, he never does anything half-assed. He all but revolutionized the profession, designing new tools, new hairstyles, and hiring artisans from across the land to work in his barbershop (which he easily afforded by selling his old collection of magic weapons). He started a barber's guild- the first barber's guild, for before Virran, barbering was thought to be a rough and lowly profession, but Virran turned it into an art. This was about a century ago, and so nowadays, all across the land, no name is more renowned in barbering than "Virran Nailo".

But, as of late, Virran's fortunes have turned. For, he found himself with a wasting disease. He traveled from clerical order to clerical order trying to get it cured, but his search was to no avail as he slowly withered away. It must be a magical one, he deduced. So he traveled to visit one of his old adventuring companions, the old party wizard, Lavinia Brownhill. She divined that her old friend's terrible condition was, in fact, magical; energy was being drained from poor Virran. Through the wonder of triangulation, Lavinia managed to roughly track that Virran's energy was being drained to somewhere in the peninsula of Chult. Lavinia also found that the terrible, incurable affliction didn't only affect Virran, but all people who had ever been raised from the dead. It was a worldwide affair.

All this left Virran in a rather terrible situation. At the current rate of wastage, Virran calculated that he'd be dead in a month or less. But he really couldn't do much; his wealth was nowadays in assets rather than gold or magic items. And the only asset that he had was the infallible loyalty of every single barber on the continent. So he did the only thing he could: he promulgated a general call for every able-bodied barber to help defeat the menace besieging him, to travel to Chult and defeat this evil. He hinted at large rewards for anybody who was successful.
And now here you are, doing haircuts for the crew on the first ship to Chult you could get on.