Many professional library and information science associations have special memberships just for MLIS students. These memberships are great ways to connect with others and get involved as a way to build your network.
The American Library Association (ALA) is a non-profit organization based in the United States that promotes libraries and library education internationally. It is the oldest and largest library association in the world, with more than 62,000 members.
http://www.ala.org/membership/whoisala/students
"Special Libraries Association is an international professional association for library and information professionals working in business, government, law, finance, non-profit, and academic organizations and institutions"
https://www.sla.org/access-membership/student-member-benefits/
An independent professional association of librarians and academic publishing professionals, working to advance and transform the management of information resources in all formats and business models, with an emphasis on scholarly communications, serials and electronic resources. Free to students.
http://www.nasig.org/site_page.cfm?pk_association_webpage_menu=309
The Society of American Archivists (established 1936) is the oldest and largest archivist association in North America, serving the educational and informational needs of more than 5,000 individual and institutional members.
http://www2.archivists.org/membership/student
The Association for Information Science and Technology (ASIS&T) is the only professional association that bridges the gap between information science practice and research.
https://www.asist.org/find-your-groups/students/
Source of descriptions of associations are from Wikipedia and/or directly from the association's website.
Signing up for Listservs from professional associations is a great way to connect with people and stay up to date with the fields you want to move into or are interested in.
Here is a list of library related listservs you can join:
https://www.loc.gov/rr/program/bib/libsci/guides.html#listservs
http://guides.lib.cua.edu/content.php?pid=60642&sid=462483
Professional Associations
Listservs
Free Virtual Library Conferences
Both Library 2.0 and The Digital Shift are annual virtual library conferences that are free and hosted live online. They are both digitally archived. The live sessions make a great for resource networking. During live sessions the chat features are turned on and you can connect with other library students and professionals in real time.