I'm talking about, for example: You can create an event, use the "plugin command" to call a plugin you have installed once clicking on the event.. I need to know how to replicate that process except doing so within a script.. That way when I click on an event that is using the "script" feature in the events it'll load a plugin that same way
You're making a wrong assumption here.
Both script calls and plugin commands are only possible if the plugin has been prepared for that option.
In the case of a plugin command, that is absolute - if a plugin does not give you a plugin command, then that will never work.
In the case of a script call, you can either use script calls provided by the plugin writer (preferred method) or you can try to jump into the plugin at existing functions (requires enough programming knowledge to find the functions and to understand them, and that the function can be called out of context which is not always the case).
So you are usually limited to the script calls and plugin commands given in the description of the plugin.
It will require a good understanding of a specific plugin to find how to use a function out of context by script call, and that will always be specific to that plugin.
So if you really need something like that, you have to give a link to the plugin you need that for, and wait for someone to find out if it is even possible to do and give you that script call - and repeat the process with different results for every single plugin you want something like that for.
(there is a reason why both plugin command and script call are given as event commands - if they could be interchanged at will, it would not be neccessary to give both options)