Create a block directory. If you don’t yet know your neighbors, this is the perfect way to get started. It doesn’t need to be fancy. Just drop off a sign-up sheet in everyone’s mailbox and, once they return it to you, you can email the final version to everyone.
If you don't live on a block, you can get similar results by networking any other group of people. It works great in apartments. It can be made to work in more scattered groups such as a church congregation, but travel is a bit more of a challenge. If you're not in walking distance, try to include transportation info like bus routes or a list of folks who want to carpool.