Just gonna chime in again, all the advice above is good, but I wouldn't put too much weight on 8/9/10... You can go try, but in my opinion it shouldn't make a huge difference. I especially wouldn't recommend going out of your way to chop up your event sheets into arbitrary numbers of events with hard limits, more so if readability and organization are sacrificed.
On the other hand, if it does help readability and organization, refactoring is absolutely a good idea.
Specifically for performance though, as I mentioned before, keep an eye out for inefficient loops and things that run every frame that don't need to run every frame by using triggers instead (#1 in George's list).