On November 8, 2016, an unprecedented collaboration of journalists, technologists and students worked together to cover the voting experience in America. Using a combination of real-time data, social media and crowdsourcing, Electionland had eyes across the country looking for voting problems, voter intimidation, and yes, even whether the election was rigged. With 1,100 participants, it was the largest journalistic collaboration in history around a single event. How did Electionland come about? How did it work? What lessons can news organizations learn about taking part in -- and hatching -- large-scale collaborations?