1) Macro 60mm/100mm
2) Tilt "n" Shift 24mm
3) 400mm F5.6
4) 300mm F2.8
7) Flashes and many more~
As you can see, you are most probably going to end up collecting lenses.... whatever you have now is good enough for daily picture taking. Whats important is that do you find the current setup you have inferior in anyway? If you do, then buy lenses that overcome these issues you have with them. However, I would suggest a flash unit possible a 430EXII or 580EXII to your current setup. The word you used is "event" and that many of you lenses do not work well in low light conditions. a flash unit would take you many notches higher. Do consider that upgrade.
I'm using a full frame camera, but I find that 16-35, 24-70, and 70-200 gives me all the range i need. If you're shooting sports or wildlife, you'll need something longer than 200 (or an extender if you like live with the image quality degradation and light loss).
I don't feel a need for primes. f/2.8 is fast enough for me in all situations, and the zooms are adequately sharp. I have a cheap-o 50mm f/1.8 just to play around with, but very rarely use it outside the house.