I usually have a "main" event sheet with no events. Then for each category of events (player controls, enemy AI, coins, etc.) I have a seperate event sheet which I include in the main one.
Inside each event sheet I then have groups for each part of that category. So if I'm making a platform game, I'd have my main event sheet which includes the Controls event sheet. Then inside the Controls one, I have a group called general for simulating movement. I also have another group called Wall Jump for that.
I find this to be the best way for me to organize my event sheets, and keeping it easy to find stuff.