How To Work With Almost Anyone by Michael Bungay Stanier

Post a review on Amazon or an equivalent sometime between June 27th and July 11th.

Post a photo of you with your copy of the book on your social media channel of choice (with #bestpossiblerelationships) before July 11th

Promote the book in your newsletter, if you have one.

Enroll a friend or colleague of yours as one of The 108 Irregulars.