You can download a pdf file of each map. See the schedule for detailed information on which presentations/events take place in which locations.
MIT Campus Map
Stata Center: 1st floor (a.k.a. Student Street)
Stata Center: 3rd floor
Stata Center: 4th floor
(note: Pub opens at 8:30pm, not 8:00pm as indicated on the map)
Pdf file Stata 4th floor map.