An entirely student run computing conference held anually at the University of Illinois at Urbana-Champaign. Reflections-Projections is organized by ACM@UIUC. The conference has three major parts:
1) A Job Fair that anyone can attend.
2) There are two day's of lectures, discussions, and workshops covering a huge range of current computing topics.
3) There's an AI programming contest called Mech Mania
see for more info.