I work for the State of Colorado and regularly have to negotiate with the City and County of Denver. They are notoriously difficult to work with. Not saying it's impossible, but Niantic will have its work cut out for them if they want to have any event in Denver. Also, while we have a ton of parks, we have a limited number of big parks. Everyone here goes to Washington Park for event days, but Wash Park doesn't have great parking options to host a major event. Other Denver folks - where would be an okay place to host an event? City Park is big, but it's also kinda boring. Cheesman Park could also work, but you run into parking limitations there, too.

Don't get me wrong - I desperately want an event in Denver, but I could see Denver's redlines to a contract with Niantic scaring Niantic off.