The Information Desk at Creese and the SORC in Rush approve flyers for posting. Flyers are approved for a length of 14 days or until the day after the event. You must also follow the guidelines of the University Posting Policy [PDF].
The bulletin board for posting flyers is located on the lower level of W.W. Hagerty Library (behind the stairwell) and in the Dragons' Den (near the security desk).