The guy who started the club was very proactive about talking to the administration. I think that nerf blasters (we were not allowed to call them guns, they are

The guy who started the club was very proactive about talking to the administration. I think that nerf blasters (we were not allowed to call them guns, they are "blasters") were originally allowed by campus policy, which made things easier. But there were many strict rules. No black, no silver, had to be a brightly colored "blaster" firing brightly colored ammo. No playing in the streets, no interacting with non-players. We were very aggressive about complying with the administration. Any request was immediately honored, and if it was unfair we'd request a change in policy on a later day. We were very diplomatic and worked very hard to be on the good side of the administration. I think this helped a lot. I'm not sure how that would scale to a city. Trying to be compliant with many police forces in different residential areas sounds a lot harder than trying to be compliant with a single college campus administration. Especially because it's a lot harder to enforce a diplomatic attitude among thousands of random players than it is among 50 people who are all either friends, or friends of friends.