Participating in a local Esperanto group is the best way to practice and one of the most satisfying parts of being an Esperanto speaker. There are clubs with weekly, monthly, and annual events and may involve conversation, practice, and games.
Everyone listed here works with the Central Office of E-USA and its informational service on a regular basis. If you belong to a club not listed and want it to be a part of the network contact E-USA. If you're thinking of starting a local group, E-USA is drafting a Handbook with ideas on how to get started. There is also a google group for local group organizers with ideas on getting started and real-time support from other group leaders.
The clubs and contact persons are divided by regions (listed to the left and below by state and below that by region).