Covid-19 forced many sports seasons to end abruptly. Others never had a chance to begin or were forced to play without fans, costing the industry billions of dollars in lost revenue from tickets and advertising, as well as weakening tourism to sports-centric cities. After nearly 18 months of limited in-person events, some stadiums are beginning to feel confident that fans can return to watch the sports they love in person thanks to medical innovation and infrastructure solutions for keeping fans and staff healthy.