The article on best practices for driving attendance has a number of ideas for promoting your show and driving attendance.
There are two ways you can share your show on public Media.
Fist you can share information about the Show. To do this on the web go to My Shows and click Share Show. When you share the show you are letting people know about the show, but you are not including a way for them to invite themselves. A common practice is to do this and post a note that says contact me if you would like an invitation.
If you are okay with an accepting the invitation you can share an open Invitation. It is similar to sharing the show but has an option for guests to make a donation and confirm their attendance. To do this on the web open MyShows, find the show, click Invite Guest and then select Share Invitation.