Recently helped my friend to take photos for his solemnization. Hmm, i guess on top of the lenses you have, get a good flash for low light conditions. Maybe also do consider the lens to be used during the process. I doubt you got time to change lens as and when you want. Just my view. I am a newbie to event shooting too.
should work fine. as long as u know where to stand (i.e. distance between u and subject). basics are still most impt. I usually shoot wedding using a 50 1.8 and a 17-50 2.8 on 2 seperate bodies to safe time changing lenses. well u know, once u miss it, u missed it. so u should balance between a good bokeh+sharpness (i assume ur prime is good) and the convi of having a zoom focal length, since u mentioned one body.
another way, is to borrow a prosumer that can cover ur other focal length when using the 50 1.4. example, ricoh gx100 (wide) and canon S5IS (telephoto).