Is it acceptable to put a future event in one's CV? I'm working on my CV for graduate school applications and was wondering about my "Presentation" section. I know that I will be attending the American Chemical Society Conference in Spring 2017 (they accepted my abstract), so is it acceptable to list that as one of my presentations?
Yes, but to avoid confusion, clearly label it as such.

Similar to how you can list papers with (submitted) or (under review), you can list presentations and posters as (confirmed) or some other indication that the plan is final and has been accepted.  If you don't label it as such, there is a risk the reader may believe the year is erroneous.