Provincial_conversion.txt has events that change a province's religion to that of the ruler, a province's religion and culture to that of the ruler, but none that change just the province's culture save for event 1091, which changes Saxon and Norman cultured provinces in England to English culture. I think that there should be events for cultural spread without religious conversions. I think two new events would do - one where a demesne province changes to the ruler culture, the other a spread event where culture spreads to a realm province with ruler culture to another that doesn't. MTTH should be something largish.
Thoughts? What ruler traits would influence the rate of cultural conversion?
Thoughts? What ruler traits would influence the rate of cultural conversion?