Zine librarians often meet at conferences such as the American Library Association’s annual, but also outside of professional library contexts. In the last few years, zine librarians of all stripes have gotten together for the Zine Librarians (un)Conference. You can find information about past and upcoming events on the ZLuC page.
Before the first ZLuC in 2009 in Seattle, there were discussions at ALA Annual 2007 about the zine libraries web site (i.e., this one!). Download those notes here.