Everyone has their own style, but I find 17mm too wide on full frame, although I used to use the 17-40 all the time on crop for landscapes. Also, filter use will start to be an issue, even at 24mm, if you use a second adaptor to allow combined use of CPL and ND grads, then a 100mm filter set will be visible in frame. I would therefore lean towards the 24-105 instead of the 17-40.
For events the 50 1.4 will likely be good, but won't let you get too wide. With the 17-40 you give up a lot of aperture (f/4), and for events I wouldn't recommend going wider than 24, with 35-40 being more the usual otherwise you'll get some 'interesting' perspective distortion on some people. Not that it's bad if you're going for that, but you need to be careful with ultra-wide on a FF.
The other challenge for events with the 5d2 is it's AF system. The center point is fairly good, but can still be pretty challenged by low lights without the AF assist beam the 480/580 EX speedlites have. You can always use those, but disable flash firing (use them just for the AF assist beam).
Otherwise, the 85 f/1.8 would be a nice filler in that gap for video. It'd be a medium to wide closeup for you, while the 135 will be a good closeup/extreme closeup and the 50 might be a nice normal with the 17-40 filling in the wider angles.