Some you will see only infrequently, but may still be valuable supporters. And some will show up once and never be seen again. Don't let this bother you. There may be a variety of reasons which have nothing to do with how well you are running the group. You need as much exposure as possible to grow your group.
Many cities have gay and lesbian newspapers which list events.
They rarely turn down a bi event listing, even if they are not otherwise bi-friendly. Some will also allow you to write an article describing your new bisexual network. Some places have a weekly newspaper or a weekly pull-out section of a daily paper which provides free calendar listings. Public Events Make an eye-catching banner with the group's P.O. box or phone number. March with it in your local Pride Day march.