Partner Newsletter
A Partner Newsletter should be created every 1-2 months and sent out to all partners and prospects (companys you visited at a company meeting). A newsletter might sound not effective, but it is a great marketing tool to raise awareness with your prospects that you still exist ("ah i got a mail from those AIESEC guys, I think they were offering me internship positions, I might call them now that I am in need...") and above all to let your current partners know more about the organization and let them bond with you and really let them understand what you do!
Münster is an LC famous for their great newsletters, here you can find examples from them.
Back then, they did it with a PDF, nowadays it should be done with a professional Email marketing tool, www.mailchimp.com is a great tool and its for free.
Be aware of the legalities, you should ask a company before sending the newsletter if it is okay to send it to them. They should also have the ability to unsubscribe your newsletter, offer them the opportunity at the end of your newsletter in small letters ("um den Newsletter abzubestellen, schicken sie uns eine kurze Mail an die vpigip.stadt@aiesec.de" or something like that)
Think about it, it doesn't cost you anything and you can delegate it to a single member who will be busy with it 3-4 hours a months and learn a lot about marketing.