Yes, it can be done and with out too much effort. First find descr_events.txt and look for some of the inconsequential events, first_windmil is a good one.
Change the "date" to whatever you want.
Then open export_descr_buildings and find for example "stone_wall city" and make it look like this,
Code:
stone_wall city requires factions { northern_european, mesoamerican, middle_eastern, eastern_european, greek, southern_european, } and event_counter first_windmill 1
Notice the "and event_counter first_windmill 1" at the end. This will mean that this core building can only be constructed after that event has happned. Consequently, every building that needs that core building and every unit that needs those building also can not be constructed because that core building needs the event.
You can make your own events, but that requires editing .bin files and mod directories and all that mess. If it is just for you, what is above is very simple. There are enough pre made events to cover five distinct eras, if you want that many.
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