Joanna Doherty was one of 12 agents to bag a place at the glitzy ceremony at the Royal Albert Hall in central London through Cunard's trade loyalty programme, Shine Rewards Club.
Doherty had previously told her client about "Cunard's refined British feel" but hadn't mentioned its entertainment offering before.
Cunard was confirmed as headline partner at the Olivier Awards for the ceremony's 50th anniversary earlier this year.
"I didn't realise how passionate my client was about theatre," the Yorkshire-based Not Just Travel franchisee told TTG. "That conversation only happened because of my experience at the Olivier Awards.