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The primary meeting room will be Room 101A (the "Fishbowl") - . You can enter this room via the wooden door to your immediate right, just inside the multiple glass doors at the front of the building. (The first door opens into a small lobby, and a second door into the room itself.)
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Warren Hall is about a 10-minute walk from the Hotel Shattuck Hotel Plaza and the Downtown Berkeley BART subway / underground train station. There are multiple ways to walk to Warren; the simplest is probably to walk North 1/2 block on Allston to Shattuck, then turn left on Shattuck (you'll be walking north, with the Berkeley Hills will be visible on your right), then turn right (toward the hills) on Hearst Ave. towards Oxford.
There's a hamburger cafe - Oscar's - on the opposite corner of Shattuck and Hearst, where you'll turn. There's also a large new building under construction directly south, across the street from Warren, with about five floors of light green glass balconies on the South side and sandy- and tan-colored stone on most other surfaces, which you can see from a considerable distance away. (Story of that building.)
Google Map with (two-way) walking directions - the arrows point to your return trip - you can mentally reverse them for directions to Warren
(I was unsuccessful at drag-route fighting Google Maps's convoluted suggestion in that direction)
