Host a party for all your neighbors.
Provide food and refreshment such that they will not want to leave. Show entertainment such as major sporting events or concerts, but make sure they are on broadcast or cable channels, not film downloads.
Consider hosting it downtown, but make sure it is attractive for kids and teens as well as the grown-ups.
If you have a micro-cell to boost phone signals, turn it off and consider jamming 3G/4G signals and even wifi, since their phones might be picking up a nearby micro-cell or wifi service.
Do not provide any of them with your home wifi password, even if they ask. In fact, disable wifi and access your service through a wired port on the router (this might be no bad thing, anyway).