Several hackerspaces/makerspaces are physical space which run on the "just give anyone access, don't worry" philosophy. It also works out suprisingly well. I kn

Several hackerspaces/makerspaces are physical space which run on the "just give anyone access, don't worry" philosophy. It also works out suprisingly well. I know spaces where over 250 people have (electronic) keys, with about 10 minutes of vetting.