Kind of a date, how does it sound?

ok, so there is this girl who has been doing a lot of my work for a class. So I am planning on asking her out to some nice italian restaurant downtown and then taking her to my friends party (kegger) and you know where from there. Anyway,I would prefer more of a friends with benefits kind of relationship.
Any suggestions on why my plan is going to fail and how I could fix it would be appreciated. Is there any chance this will work? What would be a good line to use when "talking" on saturday?