I assume you are using the inbuilt browser FChost.
View attachment 3814467
Observe the console, below the 'display changed variables'
The variable you want is V.RIEPerWeek
View attachment 3814477
In this example I am attempting to change the number to 4, its currently 3
Click 'run custom function' to execute
End week and proceed up to the Random Individual Events
View attachment 3814485
I now have 4 RIE events
Just checked the gitgud and the variable name is still the same.
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Use notepad++(Free to use) to search and edit.
Search for the text in options 'Maximum random slave events per week' using notepad++ Find in files function
View attachment 3814498
I used another phrase to find it, but you should get the idea.
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You will have to repeat these steps each time you update the game. That is why I recommend learning the game code and git functionality, with those in hand you can create your own branch with your own edits while also staying updated.