When is it a right time for your parents and your boyfriend's parents to meet for the first time?

I ve been together with my boyfriend for a year and our relationship is strong and both our parents strongly wants to meet each other.

I am an east African, he is Scandinavian. And we both live here in one of the countries in Scandinavia.
I live alone in my apartment in my city, he live with his parents in another city, but we see each other often. I sleep over at his parents places In the city or at their vacation house and he sleep often at my apartment. Longest time we ve spent together is 22 days straight.

That is very normal and not an issue here in Europe, and not a big issue in my hometown, especially in this modern world.
When is it a right time for your parents and your boyfriend's parents to meet for the first time?
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