As with most Broadway shows, a small lottery of tickets was offered before every performance as an opportunity to see the show at a highly discounted price. This lead to a daily mob of hopeful fans larger than the normal show, and #ham4ham was born. Fans could put their name in a lottery at a chance for a front row seat of that day's performance. Winners only pay ten dollars (a "Hamilton", if you will) to see the show. Because of the high demand, people were arriving early in the day and waiting hours for just the small chance at cheap tickets. To reward their patience, Lin-Manuel and the cast decided to start entertaining the awaiting groups with casual performances of songs from their show as well as others, even bringing in celebrities from outside the production to help. Many of them have been recorded, they are all amazing, and you can find them on the twitter tag #ham4ham.