Finally got home from Chicago, so I guess I can drop a few words about my experiences. It was pretty much a complete shitshow at the start in the actual park in terms of playing the game. The actual set up of the park was amazing, and if the servers had actually worked it would have been basically the perfect event in my mind. The pokestop walking route and free raids/timed events would have been great to keep people engaged while walking around. However, obviously the servers shit the bed and it was an absolute trainwreck inside. People were getting extremely restless, and there definitely was about to be a riot or something inside until they promised the refund/pokecoin rewards.
However the refund/coins was small time in comparison to the true savior of the event in my eyes, which would be expanding the borders of the stops/spawns to 2 miles around the park. That did an amazing job of getting people spread out while still engaged with the game and recreating the magic of the early release period. The attendees were, with very,very few exceptions, super friendly and excited to play the game and talk about the game/share rumors of nearby unowns. Hearing rumors of an unown or seeing it on the nearby or even just seeing people start hurriedly traveling somewhere was exciting and the momentum of the crowd traveling there was awesome. I wish the whole event would have just been that from the start, and I can only hope if they somehow make it another year with this game and hold another go fest that they would learn from that and only use the park as a central hub for maybe ceremonies/photo ops/activities while having the actual game playable within the larger area of the city.
Also, my group was in the car and about to leave the city when we saw the lugia pop at the fountain. My god I have never ran faster in my life, all passengers just jumped out of that car and joined the swarm. That was magical and definitely should be what future events are focused on (if they even happen again after this debacle)