Self-help author Mel Robbins greeted fans as she made her way to the stage at Big Night Live in Boston, where 1,300 people gathered for a book club event hosted by Kiss 108's Lisa Donovan.

In 'The Let Them Theory,' Mel Robbins charts a path forward to release what you can't change — and seize what you can.

As Mel Robbins tells it, the concept for her new self-help book, “The Let Them Theory,” came to her on the night of her son Oakley’s junior prom.