I was thinking how to structure this question, so I will write three examples. I would like to make my map as dynamic as possible.
Basic example, is there a way to use the parked cars system with other objects? You place an object, and that object will sometimes appear sometimes won't (a newspaper on a street, a car accident (this would be one object)...)...
More advanced example, object that will appear only in a time period - every day between 07-14h, object that includes group of people at a flea market for example.
Very advanced example, the flea market people example from above, but the object should appear only on Sundays.
I saw the fireworks object from the "generic" folder but, honestly, I don't understand how to apply that on my objects.
Sorry if I posted this in the wrong section, I couldn't decide should I post here or in the object development section.