This document presents a marketing campaign called "Join the Outsider Club" aimed at increasing diversity and inclusion. The campaign is based on the insight that although most people have felt like outsiders at some point, diversity is often only associated with visible minorities. It aims to normalize differences and get more people to openly discuss their experiences feeling left out. The campaign strategy includes celebrity endorsements, ads, a microsite, and an "Outsiders only" event to recruit more members over the course of 4 months and increase employer participation in diversity programs. The total estimated external costs are 415,000 Czech crowns.