First of all, you will need to be more specific. Which eventhandler are you talking about, exactly?
Now, it is possible to SORT of simulate eventhandlers in 1.46. Depending on the type, you are going to have to do it a different way. For example, instead of: "aP addeventhandler ["killed",{blahabla}]", you could have a script that starts off as: @!alive aP. Similar methods can be used for basically all of the eventhandlers, even "fired".
HOWEVER, the real power behind an eventhandler is its ability to return values, such as "who-shot-what-bullet-from-which-muzzle-and-what-type-of-bullet-was-it"
. It may be possible to get some of these values in a script, but it really depends on which values you are looking for.
Please give some specifics and I'll try to help.