We would recommend you ask the SAW folks in the MEWS for advice on this, because those small study rooms are our first choice! You can also send us a room reservation request at www.mtholyoke.edu/lits/forms and we might be able to find something to suit you.
SAW also has a room just for public speaking (I think it is called the Natalie -- Center for Public Speaking -- or something like that) in Dwight. And I bet they would let you use it for a 1/2 hour or an hour if it is being used (it often isn't.) -a student, '13
You can also try an empty classroom!